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时间状语从句常用引导词：when, while, as, as soon as, before, after, till/until, since1、when, while, as （1）三者均可表示“当时候”，如果主句表示的是短暂的动作，而从句表示的是一段时间，三者可通用。如：I met Kang Li while/when/as I was walking along the street当我沿街散步时碰见了康丽。Dont make any noise while/when/as I am recording. 我录音时（你们）别发出声音。（2）while1）while只能与持续性动词连用，且常用进行时态。表示主句的行为在从句行为进行的过程中发生。如：While they were crossing the Atlantic, many people died. 他们中的很多人在横渡大西洋时丧生了。2）表示主句和从句的动作同时发生。如：While the wife was cooking, the husband was watching TV. 妻子在做饭的时候，丈夫在看电视。3）表示“然而”，主句和从句是两个对应的动作。如：Lucy likes dancing while Lily likes doing sports. 露西喜欢跳舞而莉莉喜欢运动。（3）when1）when既可以和持续性动作连用，也可以和瞬间性动作连用，主句与从句描述的动作既可以同时发生，也可以先后发生。如：When the weather is fine, many people go out for a walk. 天气好时，很多人都出去散步。When I got home, I found my baby girl singing in the sitting room. 我到家时，发现我的小女儿正在客厅里唱歌。2）表示“某人正在做某事，突然”，主句用过去进行时，从句用一般过去时，表示一个动作正在进行的时候，另一个动作（突然）发生了，强调后一动作发生的突然性。如：We were talking when the teacher came in. 我们正在讲话，老师（突然）进来了。试比较：While we were talking, the teacher came in. 我们正在讲话的时候，老师进来了。（不强调突然性。）3）表示“某人正要做某事，就在这时”，主句用过去将来时，从句用一般过去时。如：I was leaving when somebody touched my shoulder. 我正要离开，就在此时有人碰了一下我的肩膀。（4）asas与when用法相似，但着重强调主句动作与从句动作同时发生，有“随着”或“一边一边”之意。如：As you get older, you get more knowledge. 随着年龄的增长，你获得的知识就越多。They sing as they walk. 他们一边走一边唱。练习（一）用when, while, as填空1. I was looking out of the window _ the teacher asked me.2. What is he doing _ his parents came back?3. Mike was playing games _ Jack was studying.4. I was about to fall asleep _ the baby began to cry.5. _ the children walked along the lake, they sang happily6. Someone stepped on my toes _ I was waiting for the bus. 7. _ she grew older, she became more responsible.（二）单项选择1. When I got to the factory, the workers _ about the film.A. are talkingB. talkedC. were talkingD. have talked2. I _ a letter when my mother came in.A. writeB. am writingC. was writingD. have written3. My mother _ while my father _ TV.A. cooks; was watchingB. was cooking; was watching;C. was cooked; watchedD. cooked; watched4. They were sleeping _ they heard a man _ “help”.A. when; shoutingB. while; to shoutC. when; to shoutD. while; shouting2、as soon as表示“一就”，强调动作紧密相连。如：We began to work as soon as we got there. 我们一到那儿就开始工作了。We always go somewhere interesting as soon as the holiday begins. 假期一开始，我们就会去某个好玩的地方。I will write to you as soon as I arrive there. 我一到那里就会给你写信。（主将从现）3、before, afterbefore表示“在之前”，after表示“在之后”。如：Before we begin dinner, my father gives thanks for the food. 吃饭前，我父亲会表达感激之情。Mother sometimes prepares dinner after I e back from school. 妈妈有时在我放学回家后才准备晚饭。4、until/tilluntil表示动作或状态一直持续到某一时刻，即“直到”。如：I will wait until/till you finish all the work. 我会等到你完成所有的工作。（主将从现）主句用肯定句时，主句动作为持续性动作；主句用否定句时，主句动作为瞬间性动作，常用搭配not . until “直到才”。如：He waited until all the guests left. 他一直等到所有客人都走了。The boy didnt go to sleep until his mother came back last night. 昨晚那个小男孩直到他妈妈回来才去睡觉。5、sincesince引导的时间状语从句常与完成时连用，表示“自从”，而since从句部分用一般过去时。如：I have known Bill since he was born. 从比尔出生起，我就认识他。He has studied very hard since he came to our school. 自从来到我们学校，他学习就非常努力。练习（一）在下列各句的空格中填入适当的连词1. _ he was speaking, everybody listened carefully.2. Have a good look at that man _ you pass him.3. Henry is in charge of the office _ Mr. Smith is away.4. It was already eight oclock _ we got there.5. I was about to go out _ a visitor came.6. He learned to speak German _ he was in Berlin.7. I waited _ he came back.8. He had learned Chinese _ he came to China.9. _ the work was done, we sat down to sum up experience.10. I havent seen him _ he moved to the other side of the town.11. She likes everything to be in place _ she starts to work.12. The thieves ran away _ they caught sight of the police.13. They decided to go back home _ their money ran out.14. _ I get to the airport, I will phone you to pick me up.15. They were about to leave _ it began to rain.16. He always stay in bed _ lunch time.17. I like playing tennis _ my younger sister prefers watching ball games.
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