1、初二英语时间状语从句讲解与练习1when, 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
2、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
3、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, i
4、t 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
5、写信。 make 为延续性动词3. While/When/ 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
6、了。 Wait till I call you. 等着我叫你。否定句：She didnt arrive until 6 oclock. 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。 初二英语时间状语从句讲解与练习2六、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 speaki
7、ng, everybody listened carefully. 3I saw her just _ she was getting off the train. 4Have a good look at that man _ you pass him. 5It was already eight oclock _ 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 offic
8、e _ 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 havent 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 e
9、yeglasses 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
10、 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 dont agree with you. 25. _ she grew older, she became more responsible. 2
11、6._ he was speaking, everybody listened carefully27.I was already 8:00 oclock _ we got there 28._ the work was done, we sat down to sum up experience.29.I waited _ he came back初二英语时间状语从句讲解与练习3Key: 1. When 2. While / When 3. as 4. when/as 5. when 6. when 8. while 9. while 10. whenever 11. before 12. After 13. since 14. till/until 15. until 16. before 17. as soon as 18. before 19. when 20. As soon as 21.when 22. until 23. while 24. While 25. As
