AAAA初二英语时间状语从句讲解与练习

when, while 和 as 引导时间状语从句的用法


一、when 的用法









如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.
他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
二、while 的用法

相比于when 来说，while 从句的侧重点就不一样了。while 从句的侧重点在于描述动作正在发生的状态，它
的意思是：当while 事件正在发生的时候，另一件事如何如何。所以，while 从句一般用的是正在进行时。而另
一件事的状态没有硬性的要求，根据具体情况而定。例如：
1. While my wife was reading the newspaper, I was watching TV.
当妻子正在看报纸的时候，我正在看电视。
2. While Jim was mending his bike, Lin Tao came to see him.
正当吉姆修自行车时，林涛来看他。

三、as 的用法

as 从句表示的也是一件事情正在发生，另一件事也正在进行当中。但与 while 从句不同的是，as 从句用的
一般不用正在进行时，而只是一般过去时。as 从句一般可以翻译成“边……边……”。例如：
1. As my mother sang those old songs, tears ran down her cheeks.
当我妈妈唱起那些老歌时，眼泪顺着她的脸颊流了下来。
2. As years go by，China is getting stronger and richer.
随着时间一年一年过去，中国变得越来越富强了。
少数情况下，如果强调动作正在发生，as 从句也可以用正在进行时。这只能算是特例了。
2. As we were going out, it began to snow. 正当我们出门时，雪开始下起来。

四、when, while, as 的互换

如果从句动作和主句动作同时发生，并且从句动作为延续性动词时，when，while，as 可以互换使用。这种
情况下，它们的细微区别恐怕连英、美人自己也说不清了。
1. When While As we were dancing, a stranger came in.
当我们跳舞时，一位陌生人走了进来。 [dance 为延续性动词]
2. When While As she was making a phone call, I was writing a letter.
当她在打电话时，我正在写信。 [make为延续性动词]
3. WhileWhen As I was walking down the street, I noticed a police car in front of the bank.
我顺着马路往前走时，发现银行门前停着一辆警车。
2）比较until和till
此两个连词意义相同。肯定形式表示的意思是“做某事直至某时 ”，动词必须是延续性的。否定形式表达的
意思是“直至某时才做某事”。动词为延续性或非延续性都可 以。正确使用这两个连词的关键之一就在于判断句
中的动词该用肯定式还是否定式。
肯定句：I slept until midnight. 我一直睡到半夜时醒了。
Wait till I call you. 等着我叫你。
否定句：She didn't arrive until 6 o'clock. 她直到6点才到。
区别：1）until可用于句首，而till通常不用于句首。
例如：Until you told me, I had heard nothing of what happened.
直到你告诉我以前，出了什么事我一点也不知道。

六、练习：在下列各句的空格中填入适当的连词

1．_________ he comes tomorrow, I shall ask where he has been.
2．_________ he was speaking, everybody listened carefully.
3．I saw her just _________ she was getting off the train.
4．Have a good look at that man _________ you pass him.
5．It was already eight o'clock _________ we got there.
6. I was about to go out _________ a visitor came.
8. He learned to speak German _________ he was in Berlin.
9. Henry is in charge of the office ________ Mr. Smith is away.
10. I listen to the recorder _________ I have time.
11. He had learned Chinese _________ he came to China.
12. _________ the work was done, we sat down to sum up experience.
13. I haven't seen him _________ he moved to the other side of the town.
14. I waited ________ he came back.
15. It was not ________ he took off his eyeglasses that I recognized him.
16. She likes everything to be in place ________ she starts to work.
17. The thieves ran away _________ they caught sight of the police.
18. They decided to go back home _________ their money ran out.
19. We played outside till sunset, _________ it began to rain。
20. __________ I get to the airport, I will phone you to pick me up.
21. They were about to leave ______ it began to rain.
22. He always stay in bed ______ lunch time.
23. I like playing tennis _________ my younger sister prefers watching ball games.
24. _________ I understand your viewpoint, I don’t agree with you.
25. _______ she grew older, she became more responsible.
he was speaking, everybody listened carefully
was already 8:00 o’clock ____________ we got there
the work was done, we sat down to sum up experience.
waited ____________ he came back


Key:

1. When 2. While When 3. as 4. whenas 5. when 6. when
8. while 9. while 10. whenever 11. before 12. After
13. since 14. tilluntil 15. until 16. before 17. as soon as 18. before
19. when 20. As soon as 22. until 23. while 24. While
25. As