unit 5 状语从句讲解

注意：在时间状语从句里，通常不用将来 时态，用现在时态表示将来的动作或状态。 “主将从现”例如： I’ll ring you up as soon as I get to New York. I will tell him everything when he comes back. He won’t believe it until he sees it with his own eyes. 注意：when 用在时间状语从句和宾语从句 的区别
（一息若存，希望不灭）
★ as 的常见用法： 1. She sang as she worked. 一边……一边…… 2. You must try to do as I did. 像…..一样 3. As she was late for class, she had to say sorry. 由于
6.______ After he had finished his work, he left there. 7.It is two years ______ since he came here. 8. _______ Until she told me, I had no idea of what they had said. 9.Don’t get off the bus _____ until it stops. 10.He waited for her ________ until/till 6 o’clock.
1. ______ When he comes here tomorrow, I will call you. While/When he was walking in the 2. ____________ street, he met Tim. 3. She sang ____she cooked. as as soon as 4. There was an applause ___________ she appeared on the stage. before 5. It won’t be long ______he finishes his writing.
时间状语从句
中考题型
6.It ______ ten years since they ______ to France．（河北） A．as；covered B．was；have moved C．is；have moved D．is；moved
7.He ______ wait until the rain ______ ．（南京市） A．won't；will stop B．won't；stop C．will；stops D．will；will stop
while / when 辨析
when/while+doing e.g.
When/while reading,he fell asleep. when+短暂性/延续性动词；while+延续性动词 e.g. 当老师进来时，我正在睡觉。 When the teacher came in,I was sleeping. =While /When I was sleeping, the teacher came in. when (就在这时) e.g. 我正在睡觉，就在这时有人敲门了。 I was sleeping, when someone knocked at the door.
1. ___ If you touch an English person, you should say “sorry”. 2. _____________ As long as we don’t lose heart, we’ll find a way to overcome the difficulty. 3. Don’t touch anything _______ your unless teacher tells you to.
状语从句的种类
1、时间状语从句 when, while, as soon as, since, until, before, after 2、条件状语从句 if;unless; as long as 3、原因状语从句 because;since ;as 4、目的状语从句 so that ; in order that 5、结果状语从句 so/such…that 6、让步状语从句 although, though 7、比较状语从句 than;as…as; not as/so…as
2．not…until用于否定句时，主句谓语动词是非 延续性动词，从句为肯定，意为“某动作直到某 时间才开始”。如：直到她回来我才开始看电视。
I did not watch TV until she came back.
3．till不可以置于句首，而until可以。如： Until you told me I had no idea of it.
1. 时间状语从句
引导时间状语从句的关联词常有：after,
before, when, while,as soon as, as, since, until 等。 e.g. 我吃完午饭后就去上学。 I went to school after I had my lunch. e.g. 他睡觉之前要先刷牙。 He brushed his teeth before he went to bed. Wait until he comes back. e.g. 等他回来吧。
练习 : 1. I’ll write to you _______ I get there. A. while B. before C. as soon as D. by 2. He has lived in the city _________ he came back from America. A. when B. before C. since D. after 3. We won’t leave here _______ our teacher comes back. A. until B. since C. after D. as soon as 4. I had to finish the picture ________ my mother came back. A. until B. before C. after D. while 5. John fell asleep ________ he was listening to the music. A. after B. before C. while D. as soon as
(1)在条件状语从句里，谓语动词通常用现 在时态表示将来的动作或状态。例如： I’ll help you with your English if am free tomorrow. He won’t be late unless he is ill. 注意：if用在条件状语从句和宾语从句的区别 I don’t know if he will come tomorrow. If he comes tomorrow, I will tell you.
用作状语的从句叫做状语从句。引导 状语从句的关联词是一些从属连词。




ห้องสมุดไป่ตู้
When you cross the road, you must be careful. 当你过马路时要小心。（when是从属连词） I was late because I missed the bus. 我迟到了，因为我错过了公共汽车。 （ because是从属连词） If she asks me, I’ll tell her. 她如果问我，我就告诉她。（if是从属连词） You look as if you need a rest. 你看起来好像是需要休息。（as if是从属连词）
e.g. 他来时，我在做饭。 When he came, I was cooking. e.g. 我一回来就给你打电话。 I’ll call you as soon as I come back. e.g. 他们回来前，我们已经完成工作了。 Before they came back, we had finished the work. e.g. 自从他离开后我们没见过面。 We haven’t seen each other since he left.
You’ll be late ______ you don’t get up early tomorrow morning. A. if B. when C. before D. until If he ______ on time, we will go without him A. doesn’t come B. don’t come C. didn’t come If you _______ him tomorrow, please ask him if he 如果 ______ to work on the farm with us. 是否 A. see ; goes B. will see; goes C. will see; will go D. see; will go 总结： 条件状语从句考的频率比较高，主要考查if 连词和if引导的从句与主句的时态（主将从现）
while 的其他含义：
While I was walking down the street, I came across an old friend. when ( while =_______) He likes pop music, while I am fond of but folk music. ( while =_______) While I really don’t like art, I find his although work impressive. (while=_________) While there is life there is hope. as long as (while=___________) 只要有生命在，就有希望。