什么是时间状语从句？ 什么是时间状语从句
\u4ec0\u4e48\u662f\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u5c31\u662f\u8868\u793a\u65f6\u95f4\u7684\u4ece\u53e5\u3002\u4e00\u822c\u591a\u7531after\u3001before\u3001as soon as\u3001when\u7b49\u8fde\u8bcd\u5f15\u5bfc\u3002
\u6982\u5ff5\uff1a\u5728\u590d\u5408\u53e5\u4e2d\uff0c\u7531\u65f6\u95f4\u8fde\u63a5\u8bcd\u5f15\u5bfc\u7684\u72b6\u8bed\u4ece\u53e5\u53eb\u505a\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002(\u5728\u590d\u5408\u53e5\u4e2d\uff0c\u8981\u6ce8\u610f\u4e3b\u53e5\u548c\u4ece\u53e5\u7684\u65f6\u6001\u5927\u591a\u90fd\u8981\u4fdd\u6301\u4e00\u81f4\u3002\uff09
1.\u7531when, while, as\uff0cafter,before,since,untill,\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\u4f8b\u5982\uff1a
When you think you know nothing, then you begin to know something.\u5f53\u4f60\u4ee5\u4e3a\u81ea\u5df1\u4e00\u65e0\u6240\u77e5\u7684\u65f6\u5019\uff0c\u4f60\u5c31\u662f\u5728\u5f00\u59cb\u77e5\u9053\u4e00\u4e9b\u4e8b\u7269\u4e86\u3002
When truth is buried under the ground it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.\u5f53\u771f\u7406\u88ab\u57cb\u5728\u5730\u4e0b\u7684\u65f6\u5019\uff0c\u5b83\u5728\u751f\u957f\uff0c\u5b83\u611f\u5230\u538b\u6291\uff0c\u5b83\u84c4\u5b58\u7740\u8fd9\u4e48\u4e00\u79cd\u7206\u70b8\u6027\u529b\u91cf\uff0c\u4e00\u65e6\u5192\u51fa\uff0c\u5b83\u5c31\u4f1a\u70b8\u7834\u4e00\u5207\uff01
Strike while the iron is hot. \u8d81\u70ed\u6253\u94c1\u3002
When you watch my clothes while I have a swim. \u6211\u6e38\u6cf3\u7684\u65f6\u5019\uff0c\u8bf7\u4f60\u7167\u770b\u4e00\u4e0b\u6211\u7684\u8863\u670d\u3002
You can feel the air moving as your hand pushes through it. \u5f53\u4f60\u7684\u624b\u5728\u7a7a\u6c14\u4e2d\u6325\u52a8\u7684\u65f6\u5019\uff0c\u4f60\u5c31\u80fd\u611f\u89c9\u5230\u7a7a\u6c14\u5728\u6d41\u52a8\u3002
Our headmaster laughed as she spoke.\u6211\u4eec\u7684\u6821\u957f\u8fb9\u8c08\u8fb9\u7b11\u3002
[\u7f16\u8f91\u672c\u6bb5]\u533a\u522b
when, while\u548cas\u7684\u533a\u522b\uff1awhen\u5f15\u5bfc\u7684\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u53ef\u4ee5\u662f\u5ef6\u7eed\u6027\u7684\u52a8\u8bcd\uff0c\u53c8\u53ef\u4ee5\u662f\u77ac\u65f6\u52a8\u8bcd\u3002\u5e76\u4e14when\u6709\u65f6\u8868\u793a\u201c\u5c31\u5728\u90a3\u65f6\u201d\u3002\u4f8b\u5982\uff1a
When she came in, I stopped eating.\u5979\u8fdb\u6765\u65f6\uff0c\u6211\u5728\u5403\u996d\u3002(\u77ac\u65f6\u52a8\u8bcd)
When I lived in the countryside, I used to carry some water for him.\u5f53\u7684\u4f4f\u5728\u519c\u6751\u65f6\uff0c\u6211\u5e38\u5e38\u4e3a\u4ed6\u62c5\u6c34\u3002\uff08\u5ef6\u7eed\u6027\u7684\u52a8\u8bcd\uff09
We were about to leave when he came in.\u6211\u4eec\u5c31\u8981\u79bb\u5f00\uff0c\u5c31\u5728\u90a3\u65f6\u4ed6\u8fdb\u6765\u4e86\u3002
While\u5f15\u5bfc\u7684\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u4f5c\u5fc5\u987b\u662f\u5ef6\u7eed\u6027\u7684\uff0c\u5e76\u5f3a\u8c03\u4e3b\u53e5\u548c\u4ece\u53e5\u7684\u52a8\u4f5c\u540c\u65f6\u53d1\u751f\uff08\u6216\u8005\u76f8\u5bf9\u5e94\uff09\u3002\u5e76\u4e14while\u6709\u65f6\u8fd8\u53ef\u4ee5\u8868\u793a\u5bf9\u6bd4\u3002\u4f8b\u5982\uff1a
While my wife was reading the newspaper, I was watching TV. (was reading\u662f\u5ef6\u7eed\u6027\u7684\u52a8\u8bcd\uff0cwas reading\u548cwas watching\u540c\u65f6\u53d1\u751f)
I like playing football while you like playing basketball.\u6211\u559c\u6b22\u8e22\u8db3\u7403\uff0c\u800c\u4f60\u559c\u6b22\u6253\u7bee\u7403\u3002\uff08\u5bf9\u6bd4\uff09
As\u8868\u793a\u201c\u4e00\u8fb9\u2026\u2026\u4e00\u8fb9\u201d\uff0cas\u5f15\u5bfc\u7684\u52a8\u4f5c\u662f\u5ef6\u7eed\u6027\u7684\u52a8\u4f5c\uff0c\u4e00\u822c\u7528\u4e8e\u4e3b\u53e5\u548c\u4ece\u53e5\u52a8\u4f5c\u540c\u65f6\u53d1\u751f\uff1bas\u4e5f\u53ef\u4ee5\u5f3a\u8c03\u201c\u4e00\u5148\u4e00\u540e\u3002\u4f8b\u5982\uff1a
We always sing as we walk.\u6211\u4eec\u603b\u662f\u8fb9\u8d70\u8fb9\u5531\u3002\uff08as\u8868\u793a\u201c\u4e00\u8fb9\u2026\u2026\u4e00\u8fb9\u201d\uff09
As we was going out, it began to snow.\u5f53\u6211\u4eec\u51fa\u95e8\u65f6\uff0c\u5f00\u59cb\u4e0b\u96ea\u4e86\u3002\uff08as\u5f3a\u8c03\u53e5\u4e2d\u4e24\u4e2a\u52a8\u4f5c\u7d27\u63a5\u7740\u5148\u540e\u53d1\u751f\uff0c\u800c\u4e0d\u5f3a\u8c03\u5f00\u59cb\u4e0b\u96ea\u7684\u7279\u5b9a\u65f6\u95f4\uff09
2.\u7531before\u548cafter\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\u6ce8\u610fbefore\u5f15\u5bfc\u7684\u4ece\u53e5\u4e0d\u518d\u7528\u5426\u5b9a\u5f0f\u7684\u8c13\u8bed\uff0c\u5e76\u4e14\u5f53before\u5f15\u5bfc\u7684\u4ece\u53e5\u4f4d\u4e8e\u4e3b\u53e5\u4e4b\u540e\uff0c\u6709\u65f6\u8bd1\u6210\u201c\u5c31\uff0c\u624d\u201d\u3002\u8fd8\u8981\u6ce8\u610f\u4e3b\u53e5\u548c\u4ece\u53e5\u4e4b\u95f4\u7684\u65f6\u95f4\u5173\u7cfb\u3002\u5f53\u4e3b\u53e5\u7528\u5c06\u6765\u65f6\uff0c\u4ece\u53e5\u603b\u662f\u7528\u73b0\u5728\u65f6\uff1b\u5982\u679cbefore\u5f15\u5bfc\u7684\u4e3b\u53e5\u8c13\u8bed\u7528\u7684\u662f\u8fc7\u53bb\u65f6\uff0c\u5219\u4ece\u53e5\u52a8\u8bcd\u591a\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\uff0c\u8fd9\u6837\u4ee5\u4fbf\u4f53\u73b0\u52a8\u4f5c\u53d1\u751f\u7684\u5148\u540e\u3002After\u8868\u793a\u4e3b\u53e5\u52a8\u4f5c\u53d1\u751f\u5728\u4ece\u53e5\u52a8\u4f5c\u4e4b\u540e\u3002\u4e3b\u53e5\u548c\u4ece\u53e5\u7684\u52a8\u4f5c\u7684\u65f6\u95f4\u5173\u7cfb\u6b63\u597d\u4e0ebefore\u5f15\u5bfc\u7684\u4ece\u53e5\u76f8\u53cd\u3002\u4f8b\u5982\uff1a
It will be four days before they come back. \u4ed6\u4eec\u8981\u8fc7\u56db\u5929\u624d\u80fd\u56de\u6765\u3002
Einstein almost knocked me down before he saw me.\u7231\u56e0\u65af\u5766\u51e0\u4e4e\u628a\u6211\u649e\u5012\u624d\u770b\u5230\u6211\u3002
My father had left for Canada just before the letter arrived.\u6211\u7236\u4eb2\u6070\u597d\u5728\u4fe1\u5230\u4e4b\u524d\u53bb\u52a0\u62ff\u5927\u4e86\u3002
They had not been married four months before they were divorced. \u4ed6\u4eec\u7ed3\u5a5a\u8fd8\u4e0d\u5230\u56db\u4e2a\u6708\u5c31\u79bb\u5a5a\u4e86\u3002
After you think it over, please let me know what you decide.\u4f60\u4ed4\u7ec6\u8003\u8651\u8fc7\u4ee5\u540e\uff0c\u544a\u8bc9\u6211\u4f60\u662f\u600e\u6837\u51b3\u5b9a\u7684\u3002
After we had finished the work, we went home.\u5b8c\u6210\u5de5\u4f5c\u4e4b\u540e\uff0c\u6211\u4eec\u56de\u5bb6\u4e86\u3002\uff08\u4ece\u53e5\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\uff0c\u4e3b\u53e5\u7528\u4e00\u822c\u8fc7\u53bb\u65f6\uff09
3.\u7531till\u6216until\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002till\u548cuntil\u4e00\u822c\u60c5\u51b5\u4e0b\u4e24\u8005\u53ef\u4ee5\u4e92\u6362\uff0c\u4f46\u662f\u5728\u5f3a\u8c03\u53e5\u578b\u4e2d\u591a\u7528until\u3002\u5e76\u4e14\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5982\u679c\u4e3b\u53e5\u4e2d\u7684\u8c13\u8bed\u52a8\u8bcd\u662f\u77ac\u65f6\u52a8\u8bcd\u65f6\uff0c\u5fc5\u987b\u7528\u5426\u5b9a\u5f62\u5f0f\uff1b\u5982\u679c\u4e3b\u53e5\u4e2d\u7684\u8c13\u8bed\u52a8\u8bcd\u662f\u5ef6\u7eed\u6027\u52a8\u8bcd\u65f6\uff0c\u7528\u80af\u5b9a\u6216\u5426\u5b9a\u5f62\u5f0f\u90fd\u53ef\u4ee5\uff0c\u4f46\u8868\u8fbe\u7684\u610f\u601d\u4e0d\u540c\u3002till\u4e0d\u53ef\u4ee5\u7528\u5728\u53e5\u9996\uff0c\u800cuntil\u53ef\u4ee5\u653e\u5728\u53e5\u9996\u3002\u4f8b\u5982\uff1a
I didn't go to bed until\uff08till\uff09 my father came back.\u76f4\u5230\u6211\u7236\u4eb2\u56de\u6765\u6211\u624d\u4e0a\u5e8a\u7761\u89c9\u3002
It was not until the meeting was over that he began to teach me English.\u76f4\u5230\u6563\u4f1a\u4e4b\u540e\u4ed6\u624d\u5f00\u59cb\u6559\u6211\u82f1\u8bed\u3002
I worked until he came back.\u6211\u5de5\u4f5c\u5230\u4ed6\u56de\u6765\u4e3a\u6b62\u3002
I didn't work until he came back.\u4ed6\u56de\u6765\u6211\u8fd9\u624d\u5f00\u59cb\u5de5\u4f5c\u3002
Please wait until I arrived.\u5728\u6211\u5230\u8fbe\u4e4b\u524d\u8bf7\u7b49\u6211\u3002
4.\u7531since\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002 since\u5f15\u5bfc\u7684\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u53ef\u4ee5\u662f\u5ef6\u7eed\u6027\u7684\u52a8\u8bcd\uff0c\u53c8\u53ef\u4ee5\u662f\u77ac\u65f6\u52a8\u8bcd\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u4ece\u53e5\u8c13\u8bed\u52a8\u8bcd\u7528\u4e00\u822c\u8fc7\u53bb\u65f6\uff0c\u800c\u4e3b\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u7528\u73b0\u5728\u5b8c\u6210\u65f6\u3002\u4f46\u5728It is \uff0b\u65f6\u95f4\uff0bsince\u4ece\u53e5\u7684\u53e5\u578b\u4e2d\uff0c\u4e3b\u53e5\u591a\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002\u4f8b\u5982\uff1a
I have been in Beijing since you left. \u81ea\u4ece\u4f60\u79bb\u5f00\u4ee5\u6765\uff0c\u6211\u4e00\u76f4\u5728\u5317\u4eac\u4e86\u3002
Where have you been since I last saw you? \u81ea\u4e0a\u6b21\u6211\u548c\u4f60\u89c1\u9762\u4ee5\u540e\uff0c\u4f60\u5230\u54ea\u91cc\u53bb\u4e86\uff1f
It is four years since my sister lived in Beijing. \u6211\u59b9\u59b9\u4e0d\u5728\u5317\u4eac\u4f4f\u6709\u56db\u5e74\u4e86\u3002
It is five months since our boss was in Beijing.\u6211\u4eec\u8001\u677f\u79bb\u5f00\u5317\u4eac\u6709\u4e94\u4e2a\u6708\u4e86\u3002
5.\u7531as soon as, immediately, directly, instantly, the moment, the instant, the minute, \u7b49\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\u8fd9\u4e9b\u8fde\u8bcd\u90fd\u8868\u793a\u201c\u4e00\u2026\u2026\u5c31\u201d\u3002\u4f8b\u5982\uff1a
I will go there directly I have finished my breakfast. \u5403\u5b8c\u65e9\u996d\uff0c\u6211\u7acb\u5373\u5230\u90a3\u91cc\u53bb\u3002
The moment I heard the news, I hastened to the spot.\u6211\u4e00\u542c\u5230\u6d88\u606f\uff0c\u9a6c\u4e0a\u8d76\u5230\u4e86\u51fa\u4e8b\u5730\u70b9\u3002
As soon as I reach Canada, I will ring you up. \u6211\u4e00\u5230\u52a0\u62ff\u5927\uff0c\u5c31\u7ed9\u4f60\u6765\u7535\u8bdd\u3002
[\u7f16\u8f91\u672c\u6bb5]\u6ce8\u610f
hardly(scarcely, rarely)\u2026when / before, no sooner\u2026than\u76f8\u5f53\u4e8eas soon as\u4e4b\u610f\u3002\u4e3b\u53e5\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\uff0c\u4ece\u53e5\u7528\u4e00\u822c\u8fc7\u53bb\u65f6\u3002\u5f53hardly, scarcely, rarely\u548cno sooner\u4f4d\u4e8e\u53e5\u9996\u65f6\uff0c\u4e3b\u53e5\u5e94\u7528\u5012\u88c5\u8bed\u5e8f\u3002\u4f8b\u5982\uff1a
He had no sooner arrived home than he was asked to start on another journey. \u4ed6\u521a\u5230\u5bb6\uff0c\u5c31\u88ab\u9080\u8bf7\u5f00\u59cb\u53e6\u4e00\u65c5\u7a0b\u3002
No sooner had the sun shown itself above the horizon than he got out of bed to commence work.\u592a\u9633\u521a\u4ece\u5730\u5e73\u7ebf\u4e0a\u5347\u8d77\uff0c\u4ed6\u5c31\u8d77\u5e8a\u52b3\u52a8\u53bb\u4e86\u3002
Hardly had I sat down when he stepped in.\u6211\u521a\u5750\u4e0b\uff0c\u4ed6\u5c31\u8fdb\u6765\u4e86\u3002
He had hardly fallen asleep when he felt a soft touch on his shoulder.\u8fd9\u4e2a\u963f\u62c9\u4f2f\u4eba\u521a\u8981\u5165\u7761\u5c31\u611f\u5230\u80a9\u8180\u4e0a\u88ab\u8f7b\u8f7b\u4e00\u89e6\u3002
6.\u7531by the time\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\u6ce8\u610f\u65f6\u6001\u7684\u53d8\u5316\uff1a\u5728\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u7528\u4e00\u822c\u8fc7\u53bb\u65f6\uff0c\u4e3b\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\uff1b\u5982\u679c\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u7528\u4e00\u822c\u73b0\u5728\u65f6\uff0c\u4e3b\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u7528\u5c06\u6765\u5b8c\u6210\u65f6\u3002\u4f8b\u5982\uff1a
By the time you came back, I had finished this book.\u5230\u4f60\u56de\u6765\u65f6\uff0c\u6211\u5df2\u7ecf\u5199\u5b8c\u8fd9\u672c\u4e66\u4e86\u3002
By the time you come here tomorrow, I will have finished this work. \u4f60\u660e\u5929\u6765\u8fd9\u513f\u7684\u65f6\u5019\uff0c\u6211\u5c06\u5df2\u7ecf\u5b8c\u6210\u6b64\u5de5\u4f5c\u4e86\u3002
7.\u7531each time, every time\u548cwhenever\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\u4f8b\u5982\uff1a
Each time he came to Harbin, he would call on me. \u4ed6\u6bcf\u6b21\u6765\u54c8\u5c14\u6ee8\uff0c\u603b\u662f\u6765\u770b\u6211\u3002
Whenever that man says\u201cTo tell the truth\u201d, I suspect that he's about to tell a lie.\u6bcf\u5f53\u90a3\u4e2a\u4eba\u8bf4\u201c\u8bf4\u5b9e\u5728\u8bdd\u201d\u7684\u65f6\u5019\uff0c\u6211\u731c\u60f3\u4ed6\u5c31\u8981\u8bf4\u8c0e\u4e86\u3002
You grow younger every time I see you. \u6bcf\u6b21\u9047\u5230\u4f60\uff0c\u89c1\u4f60\u66f4\u5e74\u8f7b\u4e86\u3002
8.\u7531as long as\u548cso long as\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\u8fd9\u4e24\u4e2a\u8fde\u8bcd\u8868\u793a\u201c\u53ea\u8981\u201c\u4f8b\u5982\uff1a
You can go where you like as long as you get back before dark. \u4f60\u53ef\u4ee5\u968f\u610f\u5230\u54ea\u91cc\u53bb\uff0c\u53ea\u8981\u5728\u5929\u9ed1\u4ee5\u524d\u56de\u6765\u5c31\u884c\u3002
I will fight against these conditions as long as there is a breath in my body! \u53ea\u8981\u6211\u4e00\u606f\u5c1a\u5b58\uff0c\u6211\u5c31\u8981\u53cd\u5bf9\u8fd9\u79cd\u5883\u51b5\u3002
\u8fd9\u662f\u4e00\u822c\u73b0\u5728\uff0c\u4e00\u822c\u8fc7\u53bb\uff0c\u73b0\u5728\u8fdb\u884c\uff0c\u8fc7\u53bb\u8fdb\u884c\uff0c\u73b0\u5728\u5b8c\u6210\uff0c\u8fc7\u53bb\u5b8c\u6210\uff0c\u73b0\u5728\u5b8c\u6210\u8fdb\u884c\uff0c\u4e00\u822c\u5c06\u6765\uff0c\u8fc7\u53bb\u5c06\u6765\u65f6\u7684\u65f6\u95f4\u72b6\u8bed:
1.Often,usually----------\u52a8\u8bcd\u539f\u578bdo,does,am,is, are
2.yesterday,last Sunday,in the past-------\u52a8\u8bcd\u8fc7\u53bb\u5f0fdid,was,were
3.now--------be+doing
4.while,at that time,-------was doing,were doing
5.since\u4ece\u53e5,for 2 days,------have done,have been
6.by+\u8fc7\u53bb\u7684\u67d0\u4e2a\u65f6\u95f4\u70b9----had done,had been
7.\u4e0e\u73b0\u5728\u5b8c\u6210\u76f8\u4f3c-------have been+\u6301\u7eed\u52a8\u8bcding\u5f62\u5f0f
8.\u4e00\u5207\u8868\u793a\u5c06\u6765\u7684\u65f6\u95f4\u72b6\u8bed\uff0cin+\u4e00\u6bb5\u65f6\u95f4-------\u5c06\u6765\u8981\u53d1\u751f\u7684\u4e00\u822c\u6027\u52a8\u4f5c,
will,shall+\u539f\u578b
9.\u4e0e\u4e00\u822c\u5c06\u6765\u65f6\u76f8\u4f3c-----------would+\u539f\u578b
用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。
①when
when引导时间状语时,表示主句谓语动词的动作与从句谓语动词的动作是同时发生的,或者从句的动作发生在主句的动作之前的。可表示“一段”时间或“一点”时间。
例:She was taking a walk when I called her.
我叫她时,她正在散步。
②while
while引导时间状语从句强调主句的动作和从句的动作在某一时间内同时发生,意为“在……期间,在……过程中”。while引导的时间状语从句只能表示一段时间(同延续性动词连用),不能表示一点时间(不可同非延续性动词连用)。
例:While she was watching,she heard the bell ring.
她正在看电视时听到了门铃响。
③as
as引导的时间状语从句表示“当……时,一边……一边”,指主句的动作和从句的动作同时发生,既可以表示一段时间(同延续性动词连用),也可以表示一点时间(同非延续性动词连用)。
例:I saw her as she was getting off the bus.
她下汽车时我看见了她。
When she was a child
While she was a child she lived in Harbin.(均可表示一段时间)
As she was a child
④before
before引导的时间状语从句所表示的动作发生在主句动作之后。如果强调主句的动作先完成或先发生,则主句谓语要用过去完成时,before引导的从句用一般过去时;如不强调动作的先后,主句和从句均用一般过去时。
例:He worked in Hangzhou before he came here.
他来这里之前在杭州工作。
⑤after…
after引导的时间状语从句所表示的动作发生在主句动作之前。如果强调动作的先后,after从句用过去完成时,主句用一般过去式;如果不强调动作的先后,而表示连续的动作,主句和从句均用一般过去时。
例:I shall write to you after I finish(have finished)the work.
做完工作后我将给你写信。
用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。连接时间状语从句的连接词有：when, before, after, while, as soon as, until, since...... 这里要注意一点的是，如果主句是一般将来时，从句只能用一般现在时表示将来意义。
1.when引导的时间状语从句可以接一段时间或者一个具体的时间点
while引导的时间状语从句只能接一个时间点
2 when引导的时间状语从句结构为1.主句从句都是过去式
2.主句过去式，从句过去进行时（强调一个过去动作发生时，另一个过去动作正在进行。主句动词为瞬间性，从句动词为延续性）
3.主句将来时，从句一般现在时
while引导的时间状语从句结构为1.主句从句都是现在时（表示对比）
2.主句将来时，从句现在时
希望以上的回答对你有帮助
在复杂句中，用表示时间的连词连接一个句子作状语，表示主句所发生的时间，这样的从句就是时间状语从句。常见的连接时间状语从句的连接词有：when, while, before, after, as soon as, until, since等。
一、when“当……时”，引导时间状语从句时，从句用于表示主句动作发生的特定时间。如：
The days get longer when spring comes. = When spring comes, the days get longer.
春天到来时，白天变得更长了。
二、before“在……之前”，引导时间状语从句时，表示主句动作发生在从句动作之前。如：
Close the door before you leave the room.
离开房间前关上门。
三、after“在……之后”，引导时间状语从句时，表示主句的动作发生在从句的动作之后。如：
I went to school after I finished my breakfast.
吃完早饭后我就去上学了。
四、as soon as“一……就……”，引导时间状语从句时，表示主句动作紧接着从句动作发生。如：
I’ll call you as soon as I get home.
我一到家就给你打电话。
五、until, till“直到”，引导时间状语从句。当主句谓语动词是延续性动词时，主句常用肯定形式；当主句谓语动词是非延续性动词时，主句要用否定形式，即“not…until/till…”意为“直到……才……”。如：
I’ll wait here until/till the rain stops.
我将在这里等着，直到雨停。
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