Adverbial clause
状语从句的定义：
在复合句中担任状语成分的从句，称为状语从句。
Study the following sentences:
1. It was snowing when he arrived at the station.
2. Wherever you go ,you can see new factories and stores ,new
schools and hospitals.
3. As the weather was fine ,I opened all the windows.
4. You can’t learn a language well unless you work hard.
5. Do just as you like .
6. Though it was very cold,she went out without an overcoat.
7. Come round to the window so that I can see you.
8. I didn’t go early,so that I didn’t get a good seat.
9. He is not so healthy as his brother.
状语从句的分类 ：
状语从句可分为时间、地点、原因、条件、方
式、让步、目的、结果、比较状语从句等九种。
（1）时间状语从句
由丛书连词 when,while ,after,before,since,until,
as, as soon as等引导。如：
Strike while the iron is hot .
Don’t go away before I leave.
Great changes have taken place in Beijing since
it was liberated.
You can’t not leave until you finish the work.
I’tell you as soon as I know.
Be a pupil before you become a teacher.
I’tell her about that when I see her.
We’ll wait until the doctor comes.
注：状语从句通常在前，主句在后，一般要用逗号隔开；
如主句在前，从句在后可以不用逗号,在时间状语从句
中，通常不用将来时，而用现在时来代替。
（2）地点状语从句
地点状语从句用连接副词where或wherever（在任
何地方）引导。如：
Just stay where you are.
Wherever you go, I’ll remember you forever.
(3)原因状语从句
原因状语从句由从属连词because,as（因为，语气比
弱）,since等引导。 如:
Don’t scamp your work because you are pressed for time.
Since we live near the sea ,we can often go swimming.
Because he is ill, he is absent today.
He must be ill,for he is absent today.
注：与for相比,because引导的从句表示的是更直接而不是
推断的原因，语气更强，有时可以置于主句之前。
（4）条件状语从句
条件状语从句由从属连词if,unless（除非），as（或so）
long as（只要）等引导。如：
If you demand his presence,warn him in advance.
We should serve the people as( or so) long as we live.
We’ll come over to see you on Wednesday if we have
time.
He will not leave unless it is fine tomorrow.
在条件状语从句中，通常不用一般将来时，而用一
般现在时来代替。
（5）方式状语从句
方式状语从句常用as,just as, as if等从属连词引导。如：
The man carried the box away as he was told.
He spoke as if he understood what he was talking about.
（6）让步状语从句
让步状语从句常用though,although,even if ,even
though,as, whether…or…等从属连词引导。如：
I won’t mind even if (or though) he doesn’t come.
Young as he is ,he knows a lot.
Much as she’d like to see you, she may find it
impossible to come in this terrible weather.
Whether it shines or rains,I will go tomorrow
morning.
注： as引导的让步状语从句，应将表语或状语放在句首。
（7）目的状语从句
目的状语从句常用that,so that, in order that,less等的从属连
词引导,从句中谓语动词常用may(might),can(could),should等
情态动词.如：
He just wanted me see you that we may make sure
you understand everything.
He got up early in order that he could catch the first
bus.
Jim did not answer back lest his mother should be
angry with him.
He study so hard that he passes the English exam.
Please come near to me so that I can see you clearly.
（8) 结果状语从句
结果状语从句常用so that, so…that,such…that等引导。
如：
Guilin is so beautiful a city that thousands of visitors come
to visit it each year.
He has made such great progress in English that I can’t
help admiring him.
(9)比较状语从句
比较状语从句常用as…as, not so…as,more…than,less…than,
the…the等引导。这种从句中常省略某些成分。如：
They jumped up and down as hard as they could.
The citizens of the future will have a higher standard of
living and a greater amount of leisure than we have now.
John is less clever than Peter .
The longer the period, the higher the interest rate.