1. 状语从句分类：
While I was wondering what to do, our schoolmaster came by.(时间状语从句)
Where there is fire, there is smoke. (地点状语从句)
Now that everybody is here, let’s begin our meeting.(原因状语从句)
I’ll speak slowly so that you can understand me. (目的状语从句)
It is such a wonderful story that I’ll never forgetit. (结果状语从句)
As long as you don’t lose heart, you’ll succeed in theend. (条件状语从句)
Try as the young man might, he could not find a job.(让步状语从句)
The old lady treats the boy as if he were her own son.(方式状语从句)
He is taller than I am. (比较状语从句)
2. 时间状语从句
A. when表示某一具体时间
When I stayed in London, I learned a few words ofEnglish.
B. whenever指的是在任何一个不具体的时间
Whenever I feel like doing exercise, I lie down until thefeeling passes.
C. while引导的动作一般是持续性的
While I was watching TV, my mother was cooking.
D. as强调主句和从句的动作同时发生，常译作“一边……一边……”。
He swung his stick in the air as he walked.
E. when可以表示突然性的动作
I was walking in the street when I caught sight of an oldfriend.
F. while可以表示对比及让步
I like coffee while he enjoys tea.
While we sometimes disagree, we remain good friends.
G. before的三个句型
It will be years before we meet again.
我们要过几年才能再见面。（强调时间较长）
It won’t be long before we meet again.
过不了多久我们就会再见面的。（强调时间较短）
He ran away before I could say a word.
我还没来得及说话，他就跑了。
H. since的两个句型
since后如果是终止性动词的过去式，则时间的起点应从该动作发生时算起。
since后如果是延续性动词的过去式，则时间的起点应从该动作发生结束时算起。
I haven’t seen him since he left.
自从他离开后，我就没见过他。
It is two years since he lived here.
他不住在这里有两年了。
I. 在肯定句中until搭配延续动词，在否定句中搭配瞬间动词
The shop stays open until 11.
I won’t leave until you come back.
3. 地点状语从句
He found the book where he had lost it.
You are free to go wherever you like.
4. 原因状语从句
A. because用来回答why 的问题，语气最强
I came back late yesterday because I was on duty.
B. as, since, now that表示已知的理由
Since everyone is here, let’s begin our meeting.
C. for可以表示推断，必须放在主句后
He must be asleep, for there is no light on.
5. 目的状语从句
目的状语从句中常用情态动词may (might), can (could) 等，从句往往放在主句之后
I shall write down your telephone number so that I may not forgetit.
I am saving money in order that I can buy a house.
6. 结果状语从句
A. such + (a/an) + (adj.) + n. + that
It is such a big hall that it can hold 3000 people.
They are such good students that the teacher likes them.
It was such nice weather that we had a picnic.
B. so + adj./adv. + that
He ran so fast that we couldn’t catch him.
C. so + adj. + a/an + n. + that
It is so interesting a novel that we all want to read it.
D. so + many/much/few/little + n. + that
(数量词前要用so修饰）
He gave us so much homework that it was impossible to finishit.
E. We turned up the radio, so that everyone heard the news.
(结果状语从句一般不使用情态动词)
7. 方式状语从句
A. as, like
No one can sing the song as she does.
No one can sing the song like her.
(informal) No one can sing the song like she does.
B. as if/though
She treats her sister as though she were a stranger.
It looks as though everyone has gone home.
8. 让步状语从句
1. though, although
不能与but连用，但可以与yet或still连用。though/although意义相同，用法基本一样，前者通俗，口语化，后者正式，多放主句的前面。
Although/Though he was over sixty, (yet) he began to learnFrench.
2.as引出的状语从句多用于书面语，它比用though或although引导的从句语气强，更有表现力，从句常放在句首，语序部分倒装。
Child as he is, he knows a lot.
=Although he is a child, he knows a lot.
（名词前不能有冠词）
Try as he did, he failed.
=Although he tried, he failed.
语法操练：
1. He made a mistake, but then he corrected it _____ thesituation got worse.
A. until B. when C. before D. as
2. The old man runs very fast _____ he were a young man.
A. whenever B. as if C. in case D. so as to
3. You will succeed in the end _____ you give up halfway.
A. even if B. as though C. as long as D. unless
4. Although he knew little about the large amount of work done inthe field, he
succeeded _____ other more well-informed experimentersfailed.
A. which B. that C. what D. where
5. He spoke for _____ long time _____ people began to fallasleep.
A. so; that B. such a; that C. so a; that D. such;that
6. John shut everybody out of the kitchen _____ he could preparehis grand surprise for
the party.
A. which B. when C. so that D. as if
7. _____ true, this will cause us a lot of trouble.
A. If B. Unless C. Even if D. As though
8. _____ the days passed by, the patient grew steadilybetter.
A. With B. As C. Since D. When
9. _____ I accept that he is not perfect, I do actually like theperson.
A. While B. Since C. Before D. Unless
10. CCTV is exactly like a window on the world _____ you will sitby it and fix your
attention on what it shows.
A. if B. as C. while D. unless
11. I was about to go out _____ it began to rain.
A. as B. while C. when D. if
12. Unlikely _____ it may sound, what I’m telling you istrue.
A. although B. as C. even though D. while
13. _____ you’ve got a chance, you might as well make full use ofit.
A. Now that B. After C. Although D. As soon as
14. _____, I have to put it away and focus my attention on studythis week.
A. However the story is amusing
B. No matter amusing the story is
C. However amusing the story is
D. No matter how the story is amusing
15. Girl _____, she is much naughtier than a boy.
A. although she was B. though she is
C. though was she D. although was she
16. Scientists generally agree that Earth’s climate will warm upover the next 50 to
100 years _____ it has warmed in the 20, 000 years since IceAge.
A. so long as B. as much as C. as long as D. as wellas
17. The oil must be used up, ______ the light went out.
A. for B. because C. since D. as
18. _____ she is young, she knows quite a lot.
A. When B. However C. Though D. Unless
19. _____ he finished his supper, he went out to play.
A. As far B. As long as
C. As well as D. As soon as
20. —Why do you drink so much coffee?
—Well, _____ it doesn’t keep me awake in the nights, I see noharm in it.
A. although B. as soon as C. as long as D.while
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