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1、1 时间状语从句由从属连词引导，在句子中充当时间状语的从句。1. When、 as、 while 引导的时间状语从句分析：When 引导时间状语从句时表示 “ 当的时候” ， when 既可以指时间段也可指时间点，从句中既可用延续性动词又可用非延续性动词，且动作既可和主句的动作同时发生又可在主句的动作之前或之后发生 . I ll call you when I get there. 我一到那里就给你打电话。When the wind blows, all the doors rattle. 只要风一吹，这门就吱嘎作响。When I came home my wife was cooking d
2、inner. 我回家时，妻子在做晚饭。Notice: 如果 when引导的时间状语从句的主语与主句主语相同，而从句的谓语又是be动词时，那么从句中的主语和be可以省略；当 when 引导的时间状语从句的主语与主句主语相同时，往往还可以用 “when 分词 ” 的形式替代该状语从句。When (you are) in trouble, ask her for help. 当你遭遇麻烦的时候去向她求助。When I came into the room(=When coming into the room), I found him lying there asleep. 当我进入房间的时候，我发
3、现他躺在那儿睡着了。While 引导时间状语从句时表示 “ 当的时候 ” ， 它强调主句的动作与从句的动作同时持续地进行， 用于这一用法时while 引导的时间状语从句和主句中的谓语动词必须是延续性动词，或者主句的动作发生在从句动作的进行过程中，主句中的谓语动词通常是非延续性动词，Study while you study; play while you play. 该学习的时候就学习，该玩的时候就玩。I met her while I was at school. 当我在学校的时候我遇见了她。As 引导时间状语从句时表示 “ 当时， 一边一边” ， 侧重表示两个动作同时发生(包括一个主语同时
4、进行两个动作)， 或者一种动作随着另一种动作的变化而变化。e.g. He smiled as he passed. 他经过时笑了笑。As she sang tears ran down her cheeks. 她唱歌时眼泪簌簌而下。As the wind rose the noise increased. 刮风的时候噪声增大。2. Before和 after 引导的时间状语从句分析：Before 引导时间状语从句时表示主句的动作发生在从句动作之前，after 引导时间状语从句时表示主句的动作发生在从句动作之后。See me before you leave. 在你离开之前来见我。All thi
5、ngs are difficult before they are easy. (谚语)万事开头难。She looked both ways before she crossed the road. 过马路前，她两边都看了看。I saw them after I arrived. 在我抵达之后，我见到了他们。名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 3 页 - - - - - - - - - 2 I found his pen after he has left.
6、在他走后，我找到了他的笔。3. Till 和 until 引导的时间状语从句分析：till 和 until 这两个词作连词和介词时的意义和用法相同，一般可以换用 (放在句首时通常用 until的形式，till 在口语中更为常见 )。till 和 until 引导时间状语从句时跟主句里肯定形式或否定形式的、 表示延续性动作的谓语动词连用表示“ 到为止” ， 跟主句里否定形式的、表示非延续性动作的谓语动词连用表示“ 直到才(开始)” ，Walk till you come to a white house. 一直走到一座白房子为止。I propose waiting until the polic
7、e get here. 我建议等警察来了再说。We didn t discuss the problem until he came back. 我们一直等到他回来后才讨论问题。It was not until I saw her next morning that I felt happy. 直到第二天早上见到她我才高兴。4. Since引导的时间状语从句分析：Since引导的时间状语从句表示“ 自从以来” ， 其用法主要有两种：1) 现在完成时的主句 since引导的一般过去时态的时间状语从句。He hasn t been home since he graduated. 他毕业后没回过家
8、。They have been friends ever since they were in grade school. 他们从小学起就一直是好朋友。2) It be(主句中谓语用一般式和用完成式区别不大，后者更具强调意味 )表示一段时间的词汇since引导的时间状语从句。It is two years since I became a postgraduate student. 我成为研究生已经有2 年了。It was three years since we had been there. 我们在那儿已呆了三年。注意： since做介词时也表示 “ 自从以来” ， 其具体用法有两种情况：
9、1) since表示过去某个时间点的词汇(如具体的年、月、 日期、 钟点)。They have been friends since childhood. 他们从幼时起一直是好朋友。Shes been skiing since childhood. 她从幼时起就开始滑雪。I have been there many times since the war. 自那次战争以来，我曾去该地多次。2) since表示一段时间的词汇ago 。I have been here since five months ago. 五个月以来我一直在这里。Exercises ：.I. Fill in the bla
10、nks with appropriate conjunctions. 1. Have a good look at that man _ you pass him. 2. I was about to go out _ a visitor came. 3. He learned to speak German _ he was in Berlin. 4. Henry is in charge of the office _ Mr. Smith is away. 5. I listen to the recorder _ I have time. 名师资料总结 - - -精品资料欢迎下载 - -
11、 - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 3 页 - - - - - - - - - 3 6. He had learned Chinese _ he came to China. 7. _ the work was done, we sat down to sum up experience. 8. I havent seen him _ he moved to the other side of the town. 9. I waited _ he came back. 10. It was not _ he
12、 took off his eyeglasses that I recognized him. Key: 1 when/as 2. when 3. while 4. while 5. whenever 6. before 7. After 8. since 9. till/until 10. until II. Multiple choice 1I saw her just_ she was getting off the train. A. as B. where C. before D. after 2. He was about halfway through his meal _ a
13、familiar voice came to his ears. A. why B. where C. when D. while 3. We were swimming in the lake _ suddenly the storm started. A. when B. while C. until D. before 4. I m going to the post office. _ you re there, can you get me some stamps?A. As B. While C. Because D. If 5. I_along the street lookin
14、g for a place to park when the accident_. A. went; was occurring B. went; occurred C. was going; occurred D. was going; had occurred 6. He was told that it would be at least three more months _ he could recover and return to work. A. when B. before C. since D. that 7. It was some time _ we realized
15、the truth. A. when B. until C. since D. before 8. It is difficult for us to learn a lesson in life _ weve actually had that lesson. A. until B. after C. since D. when 9. They _ the train until it disappeared in the distance. A. saw B. watched C. noticed D. observed 10. They _ friends since they met in Shanghai. A. have made B. have become C. have been D. have turned Key: 1- 5 A C A B C 6-10 B D A B C 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 3 页 - - - - - - - - -