it在英语语法中有几种用法 英语语法代词it应该怎么用？是什么意思？
\u82f1\u8bed\u8bed\u6cd5\u6709\u591a\u5c11\u79cd\uff1f\u82f1\u8bed\u4e00\u5171\u6709\u591a\u5c11\u79cd\u65f6\u6001\uff1f
\u7b54;\u82f1\u8bed\u517116\u79cd\u65f6\u6001.
http://www.cnitedu.com/wxf/ReadNews.asp?NewsID=39&BigClassName=%D1%A7%CF%B0%D4%B0%B5%D8&SmallClassName=%D3%A2%D3%EF&SpecialID=0
http://lunwen.zhupao.com/Article/2005-10-25/20070.shtml
English Grammar:\u52a8\u8bcd\u7684\u65f6\u6001
\u82f1\u8bed\u5171\u670916\u79cd\u65f6\u6001\uff0c\u6839\u636e\u8fd1\u51e0\u5e74\u66dd\u5149\u7684\u56db\u3001\u516d\u7ea7\u8003\u5377\u5206\u6790\uff0c \u65f6\u6001\u6d4b\u8bd5\u91cd\u70b9\u4e3b\u8981\u6709\uff1a\u5b8c\u6210\u65f6\u6001\u2014\u2014\u73b0\u5728\u5b8c\u6210\u65f6\u3001\u8fc7\u53bb\u5b8c\u6210\u65f6\u3001\u5c06\u6765\u5b8c\u6210\u65f6\uff1b\u8fdb\u884c\u65f6\u6001\u2014\u2014\u73b0\u5728\u8fdb\u884c\u65f6\u3001\u8fc7\u53bb\u8fdb\u884c\u65f6\u3001\u5c06\u6765\u8fdb\u884c\u65f6\u3001\u5b8c\u6210\u8fdb\u884c\u65f6\uff1b\u4e00\u822c\u65f6\u6001\u3002
\u4e00\u3001\u4e00\u822c\u65f6\u6001
1\u3001\u4e00\u822c\u73b0\u5728\u65f6
(1)\u4e00\u822c\u73b0\u5728\u65f6\u8868\u793a\u6ca1\u6709\u65f6\u9650\u7684\u6301\u4e45\u5b58\u5728\u7684\u52a8\u4f5c\u6216\u72b6\u6001\u6216\u73b0\u9636\u6bb5\u53cd\u590d\u53d1\u751f\u7684\u52a8\u4f5c\u6216\u72b6\u6001\uff0c\u5e38\u548c\u526f\u8bcd usually\uff0coften\uff0calways sometimes\uff0c regularly\uff0cnear\uff0coccasionally\uff0cevery year, every week \u7b49\u8fde\u7528\u3002\u4f8b\u5982\uff1a
1\uff09The moon moves round the earth..
2\uff09Mr. Smith travels to work by bus every day.
\uff082\uff09\u5728\u7531after\uff0cuntil\uff0cbefore\uff0conce\uff0cwhen\uff0ceven if\uff0cin case\uff0cas long as\uff0cas soon as\uff0cthe moment \u4ee5\u53ca if\uff0cunless \u7b49\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u6216\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u4e2d\uff0c\u901a\u5e38\u7528\u4e00\u822c\u73b0\u5728\u65f6\u4ee3\u66ff\u5c06\u6765\u65f6\u3002\u4f8b\u5982\uff1a
1\uff09I will tell him the news as soon as I see him.
2\uff09I will not go to countryside if it rains tomorrow.
\uff083\uff09\u67d0\u4e9b\u8868\u793a\u8d77\u59cb\u7684\u52a8\u8bcd\uff0c\u53ef\u7528\u4e00\u822c\u73b0\u5728\u65f6\u8868\u793a\u6309\u89c4\u5b9a\u3001\u8ba1\u5212\u6216\u5b89\u6392\u8981\u53d1\u751f\u7684\u52a8\u4f5c\uff0c\u8fd9\u7c7b\u52a8\u8bcd\u6709\uff1abe\uff0cgo\uff0ccome\uff0cstart\uff0cdepart\uff0carrive\uff0cbegin\uff0cleave \u7b49\u3002\u4f8b\u5982\uff1a
1\uff09The plane leaves at three sharp.
2\uff09The new teachers arrive tomorrow.
\uff084\uff09\u5728\u7531why\uff0cwhat\uff0cwhere\uff0cwhoever\uff0cwho\uff0cthat\uff0cas \u7b49\u5f15\u5bfc\u7684\u4ece\u53e5\u4e2d\uff0c\u4e5f\u5e38\u7528\u4e00\u822c\u73b0\u5728\u65f6\u4ee3\u66ff\u5c06\u6765\u65f6\u3002\u4f8b\u5982\uff1a
1\uff09Free tickets will be given to whoever comes first.
2\uff09You\u2019ll probably be in the same train as I am tomorrow.
2\uff0e\u4e00\u822c\u8fc7\u53bb\u65f6
\uff081\uff09\u8868\u793a\u8fc7\u53bb\u67d0\u4e00\u7279\u5b9a\u65f6\u95f4\u6240\u53d1\u751f\u7684\u3001\u53ef\u5b8c\u6210\u7684\u52a8\u4f5c\u6216\u72b6\u6001\uff0c\u5e38\u4e0e\u8868\u793a\u786e\u5207\u8fc7\u53bb\u65f6\u95f4\u7684\u8bcd\u3001\u77ed\u8bed\u6216\u4ece\u53e5\u8fde\u7528\u3002\u4f8b\u5982\uff1a
We went to the pictures last night and saw a very interesting film.
\uff082\uff09\u8868\u793a\u8fc7\u53bb\u4e60\u60ef\u6027\u52a8\u4f5c\u3002\u4f8b\u5982\uff1a
1\uff09He always went to class last.
2\uff09I used to do my homework in the library.
\uff08\u6ce8\u610f\u4e0ebe used to doing\u77ed\u8bed\u7684\u533a\u522b\uff09
3\uff0e\u4e00\u822c\u5c06\u6765\u65f6
1\uff09\u8868\u793a\u5c06\u6765\u6253\u7b97\u8fdb\u884c\u6216\u671f\u5f85\u53d1\u751f\u7684\u52a8\u4f5c\u6216\u72b6\u6001\u3002\u4f8b\u5982\uff1a
I shall graduate next year.
2\uff09\u51e0\u79cd\u66ff\u4ee3\u5f62\u5f0f\uff1a
1\uff09be going to +v\u5728\u53e3\u8bed\u4e2d\u5e7f\u6cdb\u4f7f\u7528\uff0c\u8868\u793a\u51c6\u5907\u505a\u6216\u5c06\u53d1\u751f\u7684\u4e8b\u60c5\u3002\u4f8b\u5982\uff1a
I\u2019m going to buy a house when we\u2019ve saved enough money.
2\uff09be to +v\u8868\u793a\u8ba1\u5212\u5b89\u6392\u8981\u505a\u7684\u4e8b\uff0c\u5177\u6709\u201c\u5fc5\u8981\u201d\u7684\u5f3a\u5236\u6027\u610f\u4e49\u3002\u4f8b\u5982\uff1a
I am to play tennis this afternoon.
3\uff09be about to +v\u8868\u793a\u5373\u5c06\u53d1\u751f\u7684\u4e8b\u60c5\u3002\u4f8b\u5982\uff1a
He was about to start.
4\uff09be due to +v\u8868\u793a\u9884\u5148\u786e\u5b9a\u4e86\u7684\u4e8b\uff0c \u5fc5\u5b9a\u53d1\u751f\u7684\u4e8b\u3002\u4f8b\u5982\uff1a
The train is due to depart in ten minutes.
5\uff09be on the point/verge of +v \u2013 ing \u5f3a\u8c03\u5373\u5c06\u53d1\u751f\u7684\u67d0\u79cd\u4e8b\u6001\u3002\u4f8b\u5982\uff1a
The baby was on the point of crying when her mother finally came home.
\u4e8c\u3001\u8fdb\u884c\u65f6\u6001
1\uff0e\u73b0\u5728\u8fdb\u884c\u65f6
\uff081\uff09\u8868\u793a\u73b0\u5728\u6b63\u5728\u8fdb\u884c\u7684\u52a8\u4f5c\uff0c\u5e38\u4e0enow\uff0cright now\uff0cat the mother\uff0cfor the time being\uff0cfor the present\u7b49\u8fde\u7528\u3002\u4f8b\u5982\uff1a
Don\u2019t disturb her. She is reading a newspaper now.
\uff082\uff09\u8868\u793a\u73b0\u9636\u6bb5\u7ecf\u5e38\u53d1\u751f\u7684\u52a8\u4f5c\uff0c \u5e38\u4e0ealways\uff0ccontinually\uff0cforever\uff0cconstantly\u7b49\u8fde\u7528\u3002\u4f8b\u5982\uff1a
My father is forever criticizing me.
\uff083\uff09\u8868\u793a\u6839\u636e\u8ba1\u5212\u6216\u5b89\u6392\u5728\u6700\u8fd1\u8981\u8fdb\u884c\u7684\u4e8b\u60c5\u3002\u5177\u6709\u8fd9\u79cd\u8bed\u6cd5\u529f\u80fd\u7684\u52a8\u8bcd\u4ec5\u9650\u4e8e\u8fc7\u6e21\u6027\u52a8\u8bcd\u3002\u5373\u8868\u793a\u4ece\u4e00\u4e2a\u72b6\u6001\u6216\u4f4d\u7f6e\u8f6c\u79fb\u5230\u53e6\u4e00\u4e2a\u72b6\u6001\u6216\u4f4d\u7f6e\u4e0a\u53bb\u7684\u52a8\u8bcd\u3002\u5e38\u7528\u7684\u6709\uff1ago\uff0ccome\uff0cleave\uff0cstart\uff0carrive\uff0creturn\u7b49\u3002\u4f8b\u5982\uff1a
They are leaving for Hong Kong next month.
\uff084\uff09\u6709\u4e9b\u52a8\u8bcd\u4e0d\u80fd\u7528\u8fdb\u884c\u65f6\uff0c\u8fd9\u662f\u4e00\u7c7b\u8868\u793a\u201c\u611f\u89c9\uff0c\u611f\u60c5\uff0c\u5b58\u5728\uff0c\u4ece\u5c5e\u201d\u7b49\u7684\u52a8\u8bcd\u3002\u5982\uff1asee\uff0chear\uff0csmell\uff0ctaste\uff0cfeel\uff0cnotice\uff0clook\uff0cappear\uff0c\uff08\u8868\u793a\u611f\u89c9\u7684\u8bcd\uff09\uff1bhate\uff0clove\uff0cfear\uff0clike\uff0cwant\uff0cwish\uff0cprefer\uff0crefuse\uff0cforgive\uff08\u8868\u793a\u611f\u60c5\u7684\u52a8\u8bcd\uff09\uff1bbe\uff0cexist\uff0cremain\uff0cstay\uff0cobtain\uff08\u8868\u793a\u5b58\u5728\u72b6\u6001\u7684\u52a8\u8bcd\uff09\uff1bhave\uff0cpossess\uff0cown\uff0ccontain\uff0cbelong\uff0cconsist of\uff0cform\uff08\u8868\u793a\u5360\u6709\u4e0e\u4ece\u5c5e\u7684\u52a8\u8bcd\uff09\uff1bunderstand\uff0cknow\uff0cbelieve\uff0cthink\uff0cdoubt\uff0cforget\uff0cremember\uff08\u8868\u793a\u601d\u8003\u7406\u89e3\u7684\u52a8\u8bcd\uff09\u3002\u4f46\u662f\u5982\u679c\u5b83\u4eec\u8bcd\u4e49\u6539\u53d8\uff0c\u4fbf\u4e5f\u53ef\u7528\u8fdb\u884c\u65f6\u6001\u3002\u4f8b\u5982\uff1a
1\uff09Tom looks pale. What\u2019s wrong with him?
\uff08look \u5728\u6b64\u4e3a\u8054\u7cfb\u52a8\u8bcd\uff0c\u610f\u4e3a\u201c\u663e\u5f97\uff0c\u770b\u4e0a\u53bb\u201d\uff09
2\uff09Tom is looking for his books.
\uff08look \u5728\u6b64\u4e3a\u5b9e\u4e49\u52a8\u8bcd\uff0c\u610f\u4e3a\u201c\u5bfb\u627e\u201d\uff09
2\uff0e \u8fc7\u53bb\u8fdb\u884c\u65f6
\u8fc7\u53bb\u8fdb\u884c\u65f6\u8868\u793a\u4e00\u4e2a\u8fc7\u53bb\u7684\u52a8\u4f5c\u53d1\u751f\u65f6\u6216\u53d1\u751f\u540e\uff0c\u53e6\u4e00\u4e2a\u8fc7\u53bb\u7684\u52a8\u4f5c\u6b63\u5728\u8fdb\u884c\uff0c\u6216\u8868\u793a\u8fc7\u53bb\u53cd\u590d\u7684\u4e60\u60ef\uff0c\u5e38\u4e0ealways\uff0ccontinually\uff0cconstantly\u7b49\u52a8\u8bcd\u8fde\u7528\u3002\u4f8b\u5982\uff1a
1\uff09We were discussing the matter when the headmaster entered.
2\uff09Whenever I visited him, he was always writing at the desk.
3\uff0e \u5c06\u6765\u8fdb\u884c\u65f6
\u5c06\u6765\u8fdb\u884c\u65f6\u4e3b\u8981\u8868\u793a\u5c06\u6765\u67d0\u4e00\u65f6\u523b\u6b63\u5728\u8fdb\u884c\u7684\u52a8\u4f5c\uff0c\u6216\u8868\u793a\u8981\u5728\u5c06\u6765\u67d0\u4e00\u65f6\u523b\u5f00\u59cb\uff0c\u5e76\u7ee7\u7eed\u4e0b\u53bb\u7684\u52a8\u4f5c\u3002\u5e38\u7528\u6765\u8868\u793a\u793c\u8c8c\u7684\u8be2\u95ee\u3001\u8bf7\u6c42\u7b49\u3002\u4f8b\u5982\uff1a
1\uff09This time next day they will be sitting in the cinema.
2\uff09What will you be doing at six tomorrow evening?
4\uff0e \u5b8c\u6210\u8fdb\u884c\u65f6
\uff08\u73b0\u5728\u3001\u8fc7\u53bb\u3001\u5c06\u6765\uff09\u5b8c\u6210\u8fdb\u884c\u65f6\u662f\uff08\u73b0\u5728\u3001\u8fc7\u53bb\u3001\u5c06\u6765\uff09\u5b8c\u6210\u65f6\u7684\u5f3a\u8c03\u5f62\u5f0f\uff0c\u5c06\u653e\u5728\u5b8c\u6210\u65f6\u6001\u90e8\u5206\u8bb2\u8ff0\u3002
\u4e09\u3001\u5b8c\u6210\u65f6\u6001
\u5b8c\u6210\u65f6\u6001\u901a\u5e38\u8868\u793a\u5df2\u5b8c\u6210\u6216\u4ece\u4e8b\u7684\u52a8\u4f5c\u3002\u5b83\u53ef\u5206\u4e3a\uff1a
1\uff0e \u73b0\u5728\u5b8c\u6210\u65f6
\uff081\uff09\u73b0\u5728\u5b8c\u6210\u65f6\u7528\u6765\u8868\u793a\u5bf9\u76ee\u524d\u72b6\u51b5\u4ecd\u6709\u5f71\u54cd\u7684\uff0c\u521a\u521a\u5b8c\u6210\u7684\u52a8\u4f5c\uff08\u5e38\u4e0eyet\uff0calready\uff0cjust\u8fde\u7528\uff09\uff0c\u6216\u8005\u8fc7\u53bb\u67d0\u4e00\u65f6\u523b\u53d1\u751f\u7684\uff0c\u6301\u7eed\u5230\u73b0\u5728\u7684\u60c5\u51b5\uff08\u5e38\u4e0efor\uff0csince\u8fde\u7528\uff09\u3002\u4f8b\u5982\uff1a
1\uff09I have just finished my homework.
2\uff09Mary has been ill for three days.
\uff082\uff09\u5e38\u4e0e\u73b0\u5728\u5b8c\u6210\u65f6\u8fde\u7528\u7684\u65f6\u95f4\u72b6\u8bed\u6709\uff1asince, for, during, over\u7b49\u5f15\u5bfc\u51fa\u7684\u77ed\u8bed\uff1b\u526f\u8bcdalready, yet, just, ever, now, before, often, lately, recently\u7b49\uff1b\u72b6\u8bed\u8bcd\u7ec4this week (morning, month, year), so far, up to now, many times, up to the present\u7b49\u3002\u4f8b\u5982\uff1a
1\uff09I haven\u2019t been there for five years.
2\uff09So far, she hasn\u2019t enjoyed the summer vacation.
3\uff09There have been a lot of changes since 1978.
\uff083\uff09\u5b8c\u6210\u65f6\u6001\u53ef\u7528\u5728\u4e0b\u5217\u7ed3\u6784\u4e2d\uff1a
This (That, It) is (was) the first (second\u2026) time +\u5b9a\u8bed\u4ece\u53e5\uff1bThis (That, It) is (was) the only (last) + n +\u5b9a\u8bed\u4ece\u53e5\uff1bThis (That, It) is (was) +\u5f62\u5bb9\u8bcd\u6700\u9ad8\u7ea7+ n +\u5b9a\u8bed\u4ece\u53e5\u3002\u5982\u679c\u4e3b\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u662f\u4e00\u822c\u73b0\u5728\u65f6\uff0c\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u901a\u5e38\u7528\u73b0\u5728\u5b8c\u6210\u65f6\uff1b\u5982\u679c\u4e3b\u53e5\u8c13\u8bed\u52a8\u8bcd\u662f\u4e00\u822c\u8fc7\u53bb\u65f6\uff0c\u4ece\u53e5\u8c13\u8bed\u52a8\u8bcd\u901a\u5e38\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\u3002\u4f8b\u5982\uff1a
\uff081\uff09This is one of the rarest questions that have ever been raised at such a meeting.
\uff082\uff09There was a knock at the door. It was the second time someone had interrupted me that evening.
2\uff0e \u8fc7\u53bb\u5b8c\u6210\u65f6
\uff081\uff09\u8868\u793a\u8fc7\u53bb\u67d0\u65f6\u95f4\u524d\u5df2\u7ecf\u53d1\u751f\u7684\u52a8\u4f5c\u6216\u60c5\u51b5\uff0c\u8fd9\u4e2a\u8fc7\u53bb\u7684\u65f6\u95f4\u53ef\u4ee5\u7528by\uff0cbefore\u7b49\u4ecb\u8bcd\u77ed\u8bed\u6216\u4e00\u4e2a\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u6765\u8868\u793a\uff1b\u6216\u8005\u8868\u793a\u4e00\u4e2a\u52a8\u4f5c\u5728\u53e6\u4e00\u4e2a\u8fc7\u53bb\u52a8\u4f5c\u4e4b\u524d\u5df2\u7ecf\u5b8c\u6210\u3002\u4f8b\u5982\uff1a
1\uff09We had just had our breakfast when Tom came in.
2\uff09By the end of last year they had turned out 5, 000 bicycles.
\uff082\uff09\u52a8\u8bcdexpect, hope, mean, intend, plan, suppose, wish, want, desire\u7b49\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\uff0c\u8868\u793a\u8fc7\u53bb\u7684\u5e0c\u671b\u3001\u9884\u671f\u3001\u610f\u56fe\u6216\u613f\u671b\u7b49\u6ca1\u6709\u5b9e\u73b0\u3002\u4f8b\u5982\uff1a
I had meant to take a good holiday this year, but I wasn\u2019t able to get away.
\u53e6\u5916\u4e24\u79cd\u8868\u793a\u201c\u8fc7\u53bb\u60f3\u505a\u800c\u672a\u505a\u7684\u4e8b\u201d\u7684\u8868\u8fbe\u65b9\u5f0f\u662f\uff1a
1\uff09was / were + to have done sth, \u4f8b\u5982\uff1a
We were to have come yesterday, but we couldn\u2019t.
2\uff09intended (expected, hope, meant, planned, supposed, wished, wanted, desired) + to have done sth, \u4f8b\u5982\uff1a
I meant to have told you about it, but I forgot to do so.
\uff083\uff09\u8fc7\u53bb\u5b8c\u6210\u65f6\u5e38\u7528\u4e8e\u4ee5\u4e0b\u56fa\u5b9a\u53e5\u578b\uff1a
1\uff09hardly, scarcely, barely + \u8fc7\u53bb\u5b8c\u6210\u65f6+ when + \u8fc7\u53bb\u65f6\u3002\u4f8b\u5982\uff1a
Hardly had I got on the bus when it started to move.
2\uff09no sooner +\u8fc7\u53bb\u5b8c\u6210\u65f6+ than +\u8fc7\u53bb\u65f6\u3002\u4f8b\u5982\uff1a
No sooner had I gone out than he came to see me.
3\uff09by (the end of ) +\u8fc7\u53bb\u65f6\u95f4\uff0c\u4e3b\u53e5\u4e2d\u8c13\u8bed\u52a8\u8bcd\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\u3002\u4f8b\u5982\uff1a
The experiment had been finished by 4 o\u2019clock yesterday afternoon.
3\uff0e \u5c06\u6765\u5b8c\u6210\u65f6
\u5c06\u6765\u5b8c\u6210\u65f6\u8868\u793a\u5728\u5c06\u6765\u67d0\u4e00\u65f6\u523b\u5c06\u5b8c\u6210\u6216\u5728\u53e6\u4e00\u4e2a\u672a\u6765\u7684\u52a8\u4f5c\u53d1\u751f\u4e4b\u524d\u5df2\u7ecf\u5b8c\u6210\u7684\u52a8\u4f5c\uff1b\u4e5f\u53ef\u4ee5\u7528\u6765\u8868\u793a\u4e00\u79cd\u731c\u6d4b\u3002\u5e38\u4e0e\u5c06\u6765\u5b8c\u6210\u65f6\u8fde\u7528\u7684\u65f6\u95f4\u72b6\u8bed\u6709\uff1aby (the time / the end of ) + \u8868\u793a\u5c06\u6765\u65f6\u95f4\u7684\u77ed\u8bed\u548c\u53e5\u5b50\uff1bbefore (the end of ) + \u8868\u793a\u5c06\u6765\u65f6\u95f4\u7684\u8bcd\u8bed\u6216\u53e5\u5b50\uff1bwhen, after\u7b49\u52a0\u4e0a\u8868\u793a\u5c06\u6765\u52a8\u4f5c\u7684\u53e5\u5b50\u7b49\u3002\u4f8b\u5982\uff1a
1\uff09By this time tomorrow you will have arrived in Shanghai.
2\uff09I shall have finished this composition before 9 o\u2019clock.
3\uff09When we get on the railway station, the train will probably have left.
4\uff0e \u5b8c\u6210\u8fdb\u884c\u65f6
\u5b8c\u6210\u8fdb\u884c\u65f6\u662f\u5b8c\u6210\u65f6\u7684\u5f3a\u8c03\u5f62\u5f0f\uff0c\u6709\u73b0\u5728\u5b8c\u6210\u8fdb\u884c\u65f6\uff0c\u8fc7\u53bb\u5b8c\u6210\u8fdb\u884c\u65f6\uff0c\u5c06\u6765\u5b8c\u6210\u8fdb\u884c\u65f6\u3002
\uff081\uff09\u73b0\u5728\u5b8c\u6210\u8fdb\u884c\u65f6\u8868\u793a\u8fc7\u53bb\u67d0\u4e00\u65f6\u523b\u4e4b\u524d\u5f00\u59cb\u7684\u52a8\u4f5c\u6216\u72b6\u6001\u4e00\u76f4\u5ef6\u7eed\u5230\u8fc7\u53bb\u67d0\u4e00\u65f6\u523b\u3002\u4f8b\u5982\uff1a
I have been looking for my lost book for three days, but I still haven\u2019t found it.
\uff082\uff09\u8fc7\u53bb\u5b8c\u6210\u8fdb\u884c\u65f6\u8868\u793a\u8fc7\u53bb\u67d0\u4e00\u65f6\u523b\u4e4b\u524d\u5f00\u59cb\u7684\u52a8\u4f5c\u6216\u72b6\u6001\u4e00\u76f4\u5ef6\u7eed\u5230\u8fc7\u53bb\u67d0\u4e00\u65f6\u523b\u3002\u4f8b\u5982\uff1a
It had been raining cats and dogs for over a week and the downpour had caused landslides in many places.
\uff083\uff09\u5c06\u6765\u5b8c\u6210\u8fdb\u884c\u65f6\u8868\u793a\u5728\u5c06\u6765\u67d0\u4e00\u65f6\u523b\u4e4b\u524d\u5f00\u59cb\u7684\u4e00\u4e2a\u52a8\u4f5c\u6216\u72b6\u6001\u4e00\u76f4\u5ef6\u7eed\u5230\u5c06\u6765\u67d0\u4e00\u65f6\u523b\u3002\u4f8b\u5982\uff1a
By the time you arrive tonight, she will have been typing for hours.
\u56db\uff1a\u65f6\u6001\u4e00\u81f4
\u65f6\u6001\u4e00\u81f4\u662f\u82f1\u8bed\u56db\u3001\u516d\u7ea7\u8003\u8bd5\u7684\u4e00\u4e2a\u91cd\u8981\u5185\u5bb9\u3002\u901a\u5e38\u5e94\u7531\u4e3b\u53e5\u8c13\u8bed\u7684\u65f6\u6001\u51b3\u5b9a\u4ece\u53e5\u7684\u8c13\u8bed\u65f6\u6001\u3002\u4e00\u822c\u539f\u5219\u662f\uff1a
1\u3001\u5f53\u4e3b\u53e5\u8c13\u8bed\u4f7f\u7528\u73b0\u5728\u65f6\u6216\u5c06\u6765\u65f6\uff0c\u4ece\u53e5\u7684\u8c13\u8bed\u6839\u636e\u5177\u4f53\u60c5\u51b5\u4f7f\u7528\u4efb\u4f55\u65f6\u6001
He says that he lives in Wuhan.
We hope that there will be many people at your party today.
\u201cDid you hear that Bill finally sold the house?\u201d \u201cYes, but I don\u2019t know who bought it.\u201d
\u201cThere\u2019s a lot of excitement on the street.\u201d
\u201cThere certainly is. Do you suppose the astronauts have returned?\u201d
2\u3001\u5f53\u4e3b\u53e5\u8c13\u8bed\u4f7f\u7528\u8fc7\u53bb\u65f6\u7684\u65f6\u5019\uff0c\u4ece\u53e5\u7684\u8c13\u8bed\u5fc5\u987b\u4f7f\u7528\u8fc7\u53bb\u8303\u56f4\u7684\u65f6\u6001
He said he was writing a novel.
The teacher wanted to know when we would finish the experiment.
He said his father had been an engineer.
3\u3001\u5f53\u4ece\u53e5\u662f\u8868\u793a\u6ca1\u6709\u65f6\u95f4\u6982\u5ff5\u7684\u771f\u7406\u65f6\uff0c\u4ece\u53e5\u7684\u8c13\u8bed\u5e94\u4f7f\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002\u4f8b\u5982\uff1a
The teacher told them since light travels faster than sound, lightning appears to go before thunder.
\u6ce8\uff1a\u5728\u6b64\u79cd\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u4e3b\u53e5\u8c13\u8bed\u7528\u4e86\u8fc7\u53bb\u5f0f\u7684\u5404\u79cd\u65f6\u6001\uff0c\u4ece\u53e5\u8c13\u8bed\u4e5f\u5e94\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002
4\u3001\u4ece\u53e5\u8c13\u8bed\u53ea\u80fd\u7528\u865a\u62df\u8bed\u6c14\u7684\u60c5\u51b5
\u5229\u7528\u65f6\u6001\u4e00\u81f4\u539f\u5219\u786e\u5b9a\u4ece\u53e5\u52a8\u8bcd\u65f6\u6001\u65f6\uff0c\u8fd8\u5e94\u6ce8\u610f\uff0c\u82e5\u4e3b\u8bed\u52a8\u8bcd\u662f\u8868\u793a\u547d\u4ee4\u3001\u8bf7\u6c42\u3001\u8981\u6c42\u3001\u5efa\u8bae\u3001\u529d\u544a\u7b49\u7684\u52a8\u8bcd\uff0c\u4ece\u53e5\u8c13\u8bed\u53ea\u80fd\u7528\u865a\u62df\u8bed\u6c14\uff0c\u4e0d\u80fd\u9075\u5faa\u65f6\u6001\u4e00\u81f4\u539f\u5219\u3002\u4f8b\u5982\uff1a
We insisted that we do it ourselves.
\u52a8\u8bcd\u7684\u8bed\u6001
\u8bed\u6001\u4e5f\u662f\u52a8\u8bcd\u7684\u4e00\u79cd\u5f62\u5f0f\uff0c\u82f1\u8bed\u6709\u4e24\u79cd\u8bed\u6001\uff1a\u4e3b\u52a8\u8bed\u6001\u548c\u88ab\u52a8\u8bed\u6001\u3002\u4e3b\u52a8\u8bed\u6001\u8868\u793a\u4e3b\u8bed\u662f\u52a8\u4f5c\u7684\u6267\u884c\u8005\uff0c\u800c\u88ab\u52a8\u8bed\u6001\u8868\u793a\u4e3b\u8bed\u662f\u52a8\u4f5c\u7684\u627f\u53d7\u8005\u3002
1\uff09We use electricity to run machines. \uff08\u4e3b\u52a8\u8bed\u6001\uff09
2\uff09Electricity is used to run machines. \uff08\u88ab\u52a8\u8bed\u6001\uff09
1\uff0e \u4e0d\u80fd\u7528\u4e8e\u88ab\u52a8\u8bed\u6001\u7684\u52a8\u8bcd\u548c\u77ed\u8bed
\uff081\uff09\u5728\u82f1\u8bed\u4e2d\uff0c\u4e0d\u53ca\u7269\u52a8\u8bcd\u4e0d\u80fd\u7528\u4e8e\u88ab\u52a8\u8bed\u6001\uff0c\u4f46\u6709\u4e9b\u4e0d\u53ca\u7269\u52a8\u8bcd\uff08\u5305\u62ec\u77ed\u8bed\uff09\u5bb9\u6613\u5f15\u8d77\u8bef\u7528\u3002\u5982\uff1aappear, belong, belong, die, escape, fall, happen, last, remain, succeed, occur, come true, take place, consist of\u3002
\uff082\uff09\u67d0\u4e9b\u8868\u793a\u72b6\u6001\u6216\u7279\u5f81\u7684\u53ca\u7269\u52a8\u8bcd\uff0c\u5982\uff1abecome, contain, cost, fit, have, resemble, suit\u4e5f\u6ca1\u6709\u88ab\u52a8\u8bed\u6001\u3002
2\uff0e \u88ab\u52a8\u8bed\u6001\u7684\u65f6\u6001\u5f62\u5f0f
\u5e38\u7528\u7684\u88ab\u52a8\u8bed\u6001\u6709\u88681 \u6240\u5217\u7684\u51e0\u79cd\u65f6\u6001\u5f62\u5f0f\u3002
\u88681
\u65f6\u95f4 \u4e00\u822c\u65f6 \u8fdb\u884c\u65f6 \u5b8c\u6210\u65f6
\u73b0\u5728 am asked am being asked
is asked is being asked
are asked are being asked
\u8fc7\u53bb
was be asked was being asked
were be asked were being asked
\u5c06\u6765 shall be asked shall have been asked
will be asked will have been asked
\u8fc7\u53bb should be asked should have been asked
\u5c06\u6765 would be asked would have been asked
3\uff0e \u77ed\u8bed\u52a8\u8bcd\u7684\u88ab\u52a8\u8bed\u6001
\u77ed\u8bed\u52a8\u8bcd\u8f6c\u6362\u4e3a\u88ab\u52a8\u8bed\u6001\u65f6\uff0c\u901a\u5e38\u88ab\u770b\u4f5c\u662f\u4e00\u4e2a\u52a8\u8bcd\uff0c\u540e\u9762\u7684\u4ecb\u8bcd\u6216\u526f\u8bcd\u4e0d\u80fd\u62c6\u5f00\u6216\u7701\u7565\u3002\u4f8b\u5982\uff1a
1\uff09So far no correct conclusion has arrived at.
2\uff09All the rubbish should be got rid of.
4\uff0e\u201cget + -ed\u5206\u8bcd\u201d\u7684\u88ab\u52a8\u8bed\u6001
\u201cget + -ed\u5206\u8bcd\u201d\u7ed3\u6784\u5f3a\u8c03\u52a8\u4f5c\u7684\u7ed3\u679c\uff0c\u800c\u975e\u52a8\u4f5c\u672c\u8eab\uff0c\u5e38\u7528\u6765\u8868\u793a\u7a81\u53d1\u6027\u7684\uff0c\u51fa\u4e4e\u610f\u6599\u7684\u5076\u7136\u4e8b\u4ef6\u3002\u4f8b\u5982\uff1a
The boy got hurt on his way home from work.
\u53e6\u5916\uff0c\u201cget + -ed\u5206\u8bcd\u201d\u8fd8\u53ef\u7528\u4e8e\u8c08\u8bba\u4e3a\u81ea\u5df1\u505a\u7684\u4e8b\uff0c\u662f\u4e3b\u52a8\u7684\u884c\u4e3a\u800c\u4e0d\u662f\u88ab\u52a8\u7684\u884c\u4e3a\u3002\u4f8b\u5982\uff1a
get dressed\uff08\u7a7f\u8863\u670d\uff09 get divorced\uff08\u79bb\u5a5a\uff09
get engaged\uff08\u8ba2\u5a5a\uff09 get confused\uff08\u8ff7\u60d1\u4e0d\u89e3\uff09
get lost\uff08\u8ff7\u8def\uff09 get washed\uff08\u6d17\u8138\uff09
get married\uff08\u7ed3\u5a5a\uff09
5\uff0e \u80fd\u5e26\u4e24\u4e2a\u5bbe\u8bed\u548c\u590d\u5408\u5bbe\u8bed\u7684\u52a8\u8bcd\u6539\u4e3a\u88ab\u52a8\u8bed\u6001
\uff081\uff09 \u80fd\u5e26\u4e24\u4e2a\u5bbe\u8bed\u7684\u52a8\u8bcd\u6539\u4e3a\u88ab\u52a8\u8bed\u6001\u65f6\uff0c\u4e00\u6b21\u53ea\u80fd\u7531\u4e00\u4e2a\u5bbe\u8bed\u4f5c\u4e3b\u8bed\uff0c\u53e6\u4e00\u4e2a\u5bbe\u8bed\u88ab\u4fdd\u7559\u4e0b\u6765\u3002\u4f8b\u5982\uff1a
1\uff09We showed the visitors our new products.\uff08\u4e3b\u52a8\u8bed\u6001\uff09
2\uff09The visitors were shown our new products.\uff08\u88ab\u52a8\u8bed\u6001\uff09
3\uff09Our new products were shown to the visitors.\uff08\u88ab\u52a8\u8bed\u6001\uff09
\uff082\uff09\u80fd\u5e26\u590d\u5408\u5bbe\u8bed\u7684\u52a8\u8bcd\u6539\u4e3a\u88ab\u52a8\u8bed\u6001\u65f6\uff0c\u539f\u6765\u7684\u5bbe\u8bed\u8865\u8db3\u8bed\u53d8\u4e3a\u4e3b\u8bed\u8865\u8db3\u8bed\u3002\u4f8b\u5982\uff1a
1\uff09The teacher appointed him League secretary.\uff08\u4e3b\u52a8\u8bed\u6001\uff09
2\uff09He was appointed League secretary.\uff08\u88ab\u52a8\u8bed\u6001\uff09
6\uff0e \u88ab\u52a8\u8bed\u6001\u4e0e\u7cfb\u8868\u7ed3\u6784\u7684\u533a\u522b
\uff081\uff09The novel was well written.\uff08\u7cfb\u8868\u7ed3\u6784\uff09
\uff082\uff09The novel was written by Diskens.\uff08\u88ab\u52a8\u8bed\u6001\uff09
7\uff0e \u5c11\u6570\u52a8\u8bcd\u7684\u4e3b\u52a8\u8bed\u6001\u6709\u65f6\u6709\u88ab\u52a8\u7684\u610f\u601d
\u4f8b1\uff1aThe book is selling remarkably well.
\u4f8b2\uff1aThe song sounds very beautiful.
\u80fd\u8fd9\u6837\u7528\u7684\u52a8\u8bcd\u8fd8\u6709read\uff08\u8bfb\u8d77\u6765\uff09\uff0cclean\uff08\u64e6\u8d77\u6765\uff09\uff0cwash\uff08\u6d17\u8d77\u6765\uff09\uff0cwrite\uff08\u5199\u8d77\u6765\uff09\u3002
\u4f8b3\uff1aMy watch needs cleaning. (= My watch needs to be cleaned).
\u80fd\u50cfneed\u8fd9\u6837\u7528\u7684\u52a8\u8bcd\u8fd8\u6709\uff1awant, require, deserve, do, owe, bind\u7b49\u3002
\u4f8b4\uff1aThe meat is cooking.
\u4f8b 5\uff1aThe book written by the professor is printing.
\u4eba\u79f0\u4ee3\u8bcdit\u53ef\u4ee5\u7528\u6765\u4ee3\u66ff\u4e00\u4e2a\u540d\u8bcd\u3001\u4e00\u4e2a\u77ed\u8bed\u3001\u4e00\u4e2a\u4ece\u53e5\u6216\u4e00\u4e2a\u53e5\u5b50\uff0c\u4ee5\u907f\u514d\u5b83\u4eec\u5728\u53e5\u4e2d\u7684\u91cd\u590d\u3002\u8fd9\u65f6\u5b83\u53ef\u4ee5\u6307\u63d0\u5230\u8fc7\u7684\uff0c\u4e5f\u53ef\u4ee5\u6307\u672a\u63d0\u5230\u8fc7\u7684\uff0c\u5728\u53e5\u4e2d\u4f5c\u4e3b\u8bed\u6216\u5bbe\u8bed\u3002
(1) \u66ff\u4ee3\u521a\u63d0\u5230\u8fc7\u7684\u540c\u4e00\u4e8b\u7269
This is our new car. I bought it yesterday. \u8fd9\u662f\u6211\u4eec\u7684\u65b0\u8f66\u3002\u6211\u6628\u5929\u4e70\u7684\u3002
(2) \u6307\u52a8\u7269\u6216\u4e0d\u8003\u8651\u6027\u522b\u7684\u5a74\u513f
Where is the cat? It\u2019s under the bed. \u732b\u5728\u54ea\uff1f\u5b83\u5728\u5e8a\u4e0b\u9762\u3002
The baby cried when it was hungry. \u8fd9\u5a74\u513f\u997f\u65f6\u5c31\u54ed\u3002
(3) \u5728\u60c5\u666f\u4e2d\u786e\u8ba4\u67d0\u4eba\u6216\u4e8b\u7269
Who is it? It\u2019s me. \u662f\u8c01\uff1f(\u95ee\u6572\u95e8\u4eba) \u662f\u6211\u5440\u3002
Who\u2019s it over there? It\u2019s the milkman. \u90a3\u8fb9\u90a3\u4eba\u662f\u8c01\uff1f\u90a3\u662f\u9001\u725b\u5976\u7684
What\u2019s this? It\u2019s a map. \u8fd9\u662f\u4ec0\u4e48\uff1f\u8fd9\u662f\u5f20\u5730\u56fe\u3002
(4) \u6307\u4ee3\u524d\u53e5\u6216\u540e\u53e5\u6240\u8ff0\u7684\u60c5\u51b5
He smokes in bed and I don\u2019t like it. \u4ed6\u5728\u5e8a\u4e0a\u62bd\u70df\uff0c\u6211\u4e0d\u559c\u6b22\u4ed6\u8fd9\u6837\u3002
When the factory closes, it will mean 500 workers will be out of work. \u5de5\u5382\u4e00\u65e6\u5173\u95ed, \u90a3\u5c31\u610f\u5473\u7740\u8981\u6709500\u5de5\u4eba\u5931\u4e1a\u3002
It would be ideal if you could join us. \u5982\u679c\u4f60\u80fd\u548c\u6211\u4eec\u5408\u4f5c\uff0c\u5219\u592a\u597d\u4e86\u3002
(5) \u6307\u65f6\u95f4\u3001\u8ddd\u79bb\u3001\u5929\u6c14\u6216\u73af\u5883\u7b49
What time is it? It\u2019s seven o\u2019clock. \u51e0\u70b9\u4e86\uff1f7\u70b9\u3002
It\u2019s time for supper. =It\u2019s time to have supper. \u662f\u8be5\u5403\u665a\u996d\u7684\u65f6\u5019\u4e86\u3002
It\u2019s about 50 kilometers from here to my home. \u4ece\u8fd9\u513f\u5230\u6211\u5bb6\u7ea6\u6709\u4e94\u5341\u516c\u91cc\u3002
It is snowing. \u6b63\u5728\u4e0b\u96ea
It was very quiet in the garden. \u516c\u56ed\u91cc\u5f88\u5bc2\u9759\u3002
(6) \u7528\u4e8e\u7b3c\u7edf\u5730\u8c08\u8bba\u67d0\u79cd\u60c5\u51b5
I cannot help it. \u6211\u4e5f\u6ca1\u529e\u6cd5\u3002
(7) \u6307\u6700\u597d\u7684\u6216\u6700\u6e34\u671b\u5f97\u5230\u4e8b\u7269
He thinks he\u2019s it. \u4ed6\u4e00\u76f4\u4ee5\u4e3a\u81ea\u5df1\u662f\u6700\u4f73\u4eba\u9009\u3002
That steak was really it! \u90a3\u725b\u6392\u771f\u662f\u4e0d\u9519\uff01
We\u2019ve been looking for a house for months and I think this is it. \u6211\u4eec\u627e\u623f\u5b50\u5df2\u7ecf\u627e\u4e86\u597d\u51e0\u4e2a\u6708\u4e86, \u6211\u770b\u8fd9\u6240\u5c31\u662f\u6211\u4eec\u8981\u627e\u7684\u3002
1. It is + 被强调部分 + that ...
该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后。被强调部分可以是主语，宾语，表语或状语。强调的主语如果是人，that可以由who换用。如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。
It was about 600 years ago that the first clock with a face and an hour hand was made.
It was they that (who ) cleaned the classroom yesterday.
It was in the street that I met her father.
2. It is not until + 被强调部分 + that ...
该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是 not ... until ... 的强调形式。
It was not until she took off her dark glasses that I realized she was a famous film star.
= Not until she took off her dark glasses did I realize she was a famous film star.
= I didn’t realize she was a famous film star until she took off her dark glasses.
3. It is clear ( obvious, true, possible, certain....) that .....
该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂ 是主语从句最常见的一种结构。
It is very clear that he’s round and tall like a tree.
= That he’s round and tall like a tree is very clear.
4. It is important ( necessary, right, strange, natural...) that ...
该句型和上一个同属一个句型。由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。建议记住该句型中的形容词。
It is important that we (should) learn English well.
It is necessary that he (should) remember these words.
5. It is said (reported, learned....) that ...
该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为＂据说（据报道，据悉．．．）＂。
It is said that he has come to Beijing.
It is reported that another earth satellite has been put into orbit.
6. It is suggested ( ordered ... ) that ...
该句型和上一个同属一个句型。主句中的过去分词是表示请求，建议，命令等词时，that 后的从句要用虚拟语气（should + 动词原形），should 可以省。常译为＂据建议；有命令．．．）
It is suggested that the meeting ( should ) be put off.
It was ordered that we ( should ) arrive there in two hours.
7. It is a pity ( a shame ... ) that ...
该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去．表示出乎意料，常译为＂竟然＂。没有这种意义时，则不用虚拟语气。
It is a pity that such a thing ( should ) happen in your class.
这种事竟然发生在你们班上，真是遗憾！
It is a pity that he is ill. 他生病了，真遗憾！
8. It is time ( about time ,high time ) that ...
该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟．② 有时也用should + 动词原形，should 不能省。常译为＂是（正是）．．．的时侯．．．＂。
It is time that children should go to bed.
= It is time that children went to bed.
9. It is the first ( second ... ) time that ...
该句型要和上一个句型区别开来。该句型中的 that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中 that 可以省去；it有时用 this 替换．常译为＂是第一（二）．．．次．．．＂。
It is the first time I have been here.
= This is the first time I have been here.
10. It is .... since ...
该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题。主句中是时间作表语，其时态是现在时或完成时，since 引导的从句通常是一般过去时态，而且是瞬间动词。如果主句是一般过去时，从句则用过去完成时。
It is ( has been ) 5 years since his father died.
11. It is ... when ...
该句型中的 when 引导的是一个时间状语从句，主句中的 it 指时间，表语由具体的时间充当。常译为＂当．．．的时候，是．．．＂。
It was 5 o’clock when he came here.
12. It be ... before ...
该句型主句中的 it 指时间, 主句中的时态常是将来一般时或过去时两种时态．主句中的表语多是long, not long , 3 days , 2 weeks 等表示时间段的词或短语。常译为＂．．．之后．．．＂。
It was 3 days before he went to Beijing.
It will be not long before he finishes his job.
13. It happens (seems, looks, appears ) that...
该句型中it是形式主语，that 引导的是主语从句，主句中的happen , seem等词是不及物动词．
It happened ( so happened ) that he met his teacher in the street. 碰巧．．
It seems that he will be back in a few days. 看来．．．
14. It takes sb. ... to do sth.
该句型中的不定式是真正的主语，it是形式主语，句型中的直接宾语是时间。常译为＂做．．．要花费某人．．．＂。
It took thousands of people many years to build the Great Wall.
15. It is no good (use ) doing sth.
该句型中的真正主语是动名词短语，主句中的表语可以是no good , ( not any good ) , no use , ( not any use )。
It is no good learning English without speaking English.
16. It doesn’t matter whether ( if ) ...
该句型中whether(if) 引导的从句是真正主语，该句型常译为 ＂不论（是否）．．．没关系．．．。
It doesn’t matter if they are old.
17. It is kind ( of sb. ) to do sth.
该句型中的不定式短语是真正主语，如果不定式的逻辑主语是由 of引起，主句中的形容词必须是能表示逻辑主语特征的形容词。常见的有： bad , brave , careless, clever , cruel , foolish , good （好心的）, honest , horrible , kind , lazy , modest , naughty , nice（有教养的）, polite, rude , silly , stupid , wise , wrong（错误的）等。 这个句型可以改写为：sb. is kind to do sth.
It is kind of you to say so.
= You are kind to say so.
18. It is necessary ( for sb. ) to do sth.
该句型与上一个同属一个句型。如果不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词。常见的形容词有：① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。
在①中的形容词作表语可以用从句改写， 如：
It is important for her to come to the party.
= It is important that she (should ) come to the party
19. It looks ( seems ) as if ...
该句型中it无意义。 as if 引导一个状语从句。常译为，＂看起来好象．．．＂如果与事实不相符合，则用虚拟语气．
It looks as if he is ill.（真的病了）
It looks as if he were ill. （没有生病）
It seemed as if he were dying.
20. We think it important to learn a foreign language.
该句型中的it 作形式宾语。为了记忆方便我们可称该句型为"6123结构"。
6指主句中常用的动词：think, believe, make, find, consider, feel；
1指的是形式宾语it；
2指的是宾补的两种形式：形容词或名词；
3指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。
We think it our duty to clean our classroom every day.
He felt it important learning English well.
They found it difficult that they would finish their work in two days.
一般语法书中 代词it共有7种用法：
i) 第三人称单数代词，指代“物”（最常见用法）。例如：It is my umbrella .
ii) 指代天气、时间、环境、距离等“抽象概念”。例如：It is raining heavily now. 或者 It has been a long time since I last saw her.
iii) 指代“事情”。例如：It's none of your business. 或者 ---Can you help me now?---What is it?
iv) 指代前句中提到的名词。例如： She has a round face. It is very beautiful , too.
v) 指代身份暂时不详的人等等。例如：----Who's there at the door? ----It must be George, I think.
vi) 作形式主语。例如： It is a pity for you to cheat in an exam. 或者 It's impossible that Harry can't speak English.
vii) 作形式宾语。例如：I hate it that you didn't tell me the truth.
以上哪种用法不明白可以再问~ 会详细解释
代词it指代
1、第三人称单数名词。
2、指代天气、时间、环境、距离等概念
3、指代一件事情。
4、指代句中或者句末名词，置于句首
5、指代婴儿，指代“面目不详”的人，如敲门等
6、特殊句式中作形式主语，如
it is likely that。。。等
7形式宾语
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绛旓細2. 鐢ㄦ硶鎸囧崡 (1)浣滀负浜虹О浠ｈ瘝锛宨t鍙互鐢ㄦ潵鎸囦笢瑗裤佸姩鐗┿佸┐鍎垮拰鏈‘瀹氳韩浠界殑浜恒俉here's my book? Have you seen it?鎴戠殑涔﹀湪鍝噷锛熶綘鐪嬭浜嗘病鏈夛紵The dog is in the garden, isn't it?鐙楀湪鑺卞洯閲岋紝鏄惂锛烼he baby cried because it is hungry.濠村効鍝簡锛屽洜涓轰粬/濂归タ浜嗐(Someone is ...
绛旓細It鐢ㄦ硶灏忕粨 it鍦ㄨ嫳璇娉曚腑灞炰汉绉颁唬璇嶏紝鎰忔濇槸鈥滃畠鈥濓紝鐢ㄦ潵鎸囦汉浠ュ鐨勪竴鍒囩敓鐗╁拰浜嬬墿銆傚畠鐨勭敤娉曚笉浠呬笉绠鍗曪紝鑰屼笖寰堝鏉傘備竴銆佺敤浜庢寚浜轰互澶栫殑涓鍒囩敓鐗┿佹棤鐢熷懡鐨勪笢瑗垮拰浜嬫儏銆備竴鑸寚璇磋瘽鑰呭績鐩腑宸茬粡浜嗚В鎴栨墍鎸囩殑鐢熺墿銆佹棤鐢熷懡鐨勪笢瑗挎垨浜嬫儏銆佹病鏈夋у埆鐨勫尯鍒嗭紱鍙互鏄彲鏁板悕璇嶏紝涔熷彲浠ユ槸涓嶅彲鏁板悕璇嶏紝鍦ㄥ彞瀛愪腑...
绛旓細涓銆佷唬璇峣t , 浜屻佸紩瀵艰瘝it , 涓夈it鍦寮鸿皟缁撴瀯涓 ,寮鸿皟鍙ュ瀷锛欼t is (was) +琚己璋冮儴鍒+ that (who) + 鍏跺畠, 璇存槑锛 鍘熷彞鐨勮皳璇姩璇嶅鏋滄槸鐜板湪鎴栧皢鏉ユ椂鎬佺敤It is 鈥 that (who)濡傛灉鍘熷彞璋撹鍔ㄨ瘝鏄繃鍘绘椂鎬侊紝鍒欑敤It was 鈥 that (who)銆傚湪寮鸿皟鏃堕棿锛屽湴鐐癸紝鍘熷洜鎴栨柟寮忔椂涓嶈鐢╳hen, ...
绛旓細2. 鐢ㄦ硶鎸囧崡 (1)浣滀负浜虹О浠ｈ瘝锛宨t鍙互鐢ㄦ潵鎸囦笢瑗裤佸姩鐗┿佸┐鍎垮拰鏈‘瀹氳韩浠界殑浜恒 Where's my book? Have you seen it? 鎴戠殑涔﹀湪鍝噷锛熶綘鐪嬭浜嗘病鏈夛紵 The dog is in the garden, isn't it?鐙楀湪鑺卞洯閲岋紝鏄惂锛 The baby cried because it is hungry.濠村効鍝簡锛屽洜涓轰粬/濂...
绛旓細鈶 It is surprising that he came late to school this morning.鈶 It is important that we (should) study hard 娉ㄦ剰: 璇ュ彞鍨嬩腑鐨勫舰瀹硅瘝鏄紙un锛塱mportant, necessary绛夋椂锛屼粠鍙ュ簲涓 (should )+鍔ㄨ瘝鍘熷舰銆 鈼 It + be + -ed 鍒嗚瘝+ that-浠庡彞 閫傜敤璇ュ彞鍨嬬殑杩囧幓鍒嗚瘝涓昏鏈: said, reported...
绛旓細1) 姝ゅ彞涓紝it鏄舰寮忎富璇傚舰寮忎富璇璱t鍙寚浠ｅ姩鍚嶈瘝鐭銆佷笉瀹氬紡鐭鎴栦粠鍙ャ備緥濡,It is a waste of time arguing with him.It is easy to finish the work.It is said that he killed his wife.2) 璇ュ彞瀛愬拰that 鎵笉涓婂叧绯汇傚洜涓烘鍙ヤ腑seeing you sitting here alone 鏄疄闄呯殑涓昏銆備笉鏄粠鍙...
绛旓細1銆佷富鍙ヤ负it鏃 2銆佷富鍙ヤ负鍔ㄧ墿鎴栨煇绉嶄笢瑗跨殑鍗曟暟鏃 3銆佷富璇负something anything nothing everything鏃 4銆侀檲杩板彞涓殑this\that 鍦ㄥ弽涔夌枒闂彞涓鍙樹负it
