英语中it用法的总结？
It is 可用于强调句、定语从句、主语从句等多种句型，举例如下：
一、It is(was)⋯⋯that⋯⋯句型, It is + 被强调成分 + that +句子剩余部分 （强调句）
可以分别用来强调主语、宾语、地点状语和时间状语。如：
1、It was he who( that)read three books in the library yesterday.(强调主语)
是他昨天在图书馆读了三本书。
2、It was three books that he read in the library yesterday.(强调宾语)
他昨天在图书馆读了三本书。
It was in the library that he read three books yesterday.(强调地点状语)
他昨天是在图书馆里读了三本书。
二、It is +名词+定语从句
It was the day my grandmother was angry.
那一天我外婆生气了。
三、It is +名词/形容词+不定式主语
It做形式主语，句子真正的主语是不定式。
It was a pleasure to draw pictures.
画画是一种享受。
四、It is + no use + 动名词主语
It做形式主语，句子真正的主语是动名词 。
It is no use doing what you like; you have got to like what you do.
做你喜欢的事是没有用的；你必须喜欢你做的事。
五、It is +名词/形容词+主语从句
It做形式主语，句子真正的主语是主语从句。如：
It was inevitable that the scent of flowers always reminded him of past events.
这是不可避免的：花的味道总是让他想起过去的往事。
六、It 还用于指代时间、距离、价值、天气，以及不明确的人（包括性别不明的婴儿、敲门或打来电话的人。在不知道对方性别前，无法确定该用he还是she，往往用it）。
It was a bright cold day in March.
这是三月的寒冷的一天。
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绛旓細1.鐢ㄤ綔褰㈠紡涓昏銆It is difficult to translate this article.缈昏瘧杩欑瘒鏂囩珷寰堥毦銆侷t is no usr going there so early.杩欎箞鏃╁幓閭ｉ噷娌℃湁鐢ㄣ侷t doesn't matter what you do.浠涔堥兘娌″叧绯汇侷t is strange that he did not come at all.鐪熷鎬紝浠栫珶杩樻病鏉ャ傚湪涓婅堪渚嬪瓙涓紝鍚庣疆鐨勭湡姝ｄ富璇彲浠...
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绛旓細it鍜it is鐢ㄦ硶锛1銆佸仛浠ｈ瘝,浠ｆ浛鍒氭彁鍒扮殑杩囩殑涓浠朵簨鎯.a.鍙互鎸囦竴涓叿浣撶殑涓滆タ.b.鍙互鎸囧墠闈㈡墍璋堢殑浜嬫儏鎴栨儏鍐.渚嬪彞锛1銆両t鈥檚 a nice room.2銆乊ou promised to write the article,and you must do it.2銆佸仛浠ｈ瘝浠ｆ浛鎸囩ず浠ｈ瘝 this,that 渚嬪彞锛歐hat鈥檚 this?鈥斺擨t鈥檚 a flag.3銆佽捣鎸囩ず...
绛旓細It's time to do sth. 鍚庡姞鍔ㄨ瘝鍘熷舰锛屾槸璇ュ仛浠涔堜簨鐨勬椂鍊欎簡銆備緥瀛愶細it's time to rest. 鏄浼戞伅鐨勬椂鍊欎簡銆侷t's time for (doing) sth. 鍚庡姞鍔ㄨ瘝ing褰㈠紡鎴栧悕璇嶏紝鎰忔濓細鏄鏌愪汉鍋氫粈涔堜簨鐨勬椂鍊欎簡銆侷t's time for resting. 鏄浼戞伅鐨勬椂鍊欎簡銆
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