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状语从句在复合句中修饰主句中的谓语动词、形容词或副词等。状语从句一般由从属连词引导。当状语从句位于句首或句中时，通常用逗号将其与主句隔开。当状语从句位于句尾时，可以不用逗号隔开。状语从句分类如下：
[类型 引导词 时间状语从句 when， before， after， as， while， as soon as， since， not... until...， whenever等 原因状语从句 because， as， since等 条件状语从句 if， unless等 比较状语从句 as / so... as...， than等 结果状语从句 so / such... that...等 目的状语从句 in order that， so that等 让步状语从句 although / though， even though / if等 ]
这里着重介绍以下三种状语从句用法及涉及到的考点：
一、unless引导的条件状语从句
unless意为“如果不;除非”，相当于if... not。
We
=We
注意：unless和if引导条件状语从句时，从句常用一般现在时表示将来，而主句则用一般将来时，即遵循“主将从现”原则。
二、as soon as引导的时间状语从句
as soon as意为“一……就……”，表示从句和主句的动作先后发生，间隔短暂。
The students became quiet as soon as the teacher came in. 老师一进来，学生们就安静下来了。
注意：as soon as可表示将来的事，这时主句用一般将来时，从句常用一般现在时，即遵循“主将从现”原则。
You
三、so... that...引导的结果状语从句
so... that...意为“如此……以至于……”，引导结果状语从句。常见于以下四种结构：
（1） so+形容词/副词+that从句。
He ran so fast that we couldn
（2） so+形容词+a / an+单数名词+that从句。
It is so interesting a book that I want to read it again. 这本书如此有趣，我还想再读一遍。
（3） so+many / few+复数名词+that从句。
He has so few friends that he often feels lonely. 他朋友很少，所以他经常感到孤独。
（4） so+much / little+不可数名词+that从句。
There was so much work to do that everybody got bored. 有这么多的事要做，人人都感到厌烦了。
注意：such... that...意为“如此……以至于……”，也可以引导结果状语从句，但such修饰的是名词。
They are such good students that the teacher likes them. 他们都是很好的学生，所以老师喜欢他们。
四、so... that... / unless / as soon as句型改写考点
（1） so... that...
so... that...引导结果状语从句，当that后面接否定句时，可以与“too... to... （太……而不能……）”结构互换。
He was so angry that he couldn
=He was too angry to say a word.
拓展：在so... that...句型中，当主句的主语与that引导的从句的主语一致时，“ so... that+肯定句”句型可与“enough to...”句型互換;“ so... that+否定句”句型可与“too... to...”句型互换。
He was so clever that he could understand what I said. 他很聪明，能听懂我说的话。
=He was clever enough to understand what I said.
The girl is so young that she can
=The girl is too young to dress herself.
（2） unless
unless意为“如果不……;除非”，引导条件状语从句，相当于if条件状语从句的否定形式，即unless=if... not。
Unless you put on your raincoat you
=If you don
（3） as soon as
as soon as意为“一……就……”，其中的从句通常用一般现在时表示将来。可以用于口语和书面语中。它在句中的位置比较灵活，而且可以用于各种时态。
I
As soon as I went in， Tom cried out with pleasure. 我一进去，汤姆就高兴地叫了起来。（一般过去时）
as soon as可以用the minute 来改写。
As soon as I went in， Tom cried out with pleasure. =The minute I went in， Tom cried out with pleasure.
【趁热打铁】
一、单项选择。
1. They will lose the game ______ they try their best.
A. unless B. once C. since D. after
2. —The air pollution is terrible.
—It will be worse ______ we take actions to protect the environment.
A. if B. unless C. until D. when
3. In summer milk quickly goes bad ______ it is put into a fridge.
A. though B. unless
C. because D. once
4. —When will you return the book to me？
—I
A. once B. until C. as soon as D. unless
5. Prince George is ______ lovely that many people like him very much.
A. very B. such C. as D. so
二、選用方框中所给的连词填空。
so... that...， unless， as soon as
1. Teresa is ______ nervous ______ she can
2. —Your aunt often walks the dog in the morning.
—Yeah， ______ bad weather stops her.
3. Learning to write is learning to think. You don
4. I
5. I worked ______ hard ______ I got the first place.
6. Please remember to call me ______ you get home， Lisa.
7. You won
8. I will tell you ______ I arrive.
9. Mr. Green enjoys fresh air and he always sleeps with the window open ______ it is really cold.
10. The animals were ______ lovely ______ I spent a whole day in the zoo.
三、同义句转换，每空一词。
1. Tom will call you when he gets there.
Tom will call you ______ ______ ______ he gets there.
2. If it isn
They will go on a picnic tomorrow ______ it is snowy.
3. He is too weak to carry the box.
He is ______ ______ ______ he can
4. The movie is so exciting that all of us want to see it again.
It is ______ ______ ______ movie that all of us want to see it again.
5. She is too young to do the work.
She is ______ ______ ______ she can
[类型 引导词 时间状语从句 when， before， after， as， while， as soon as， since， not... until...， whenever等 原因状语从句 because， as， since等 条件状语从句 if， unless等 比较状语从句 as / so... as...， than等 结果状语从句 so / such... that...等 目的状语从句 in order that， so that等 让步状语从句 although / though， even though / if等 ]
这里着重介绍以下三种状语从句用法及涉及到的考点：
一、unless引导的条件状语从句
unless意为“如果不;除非”，相当于if... not。
We
=We
注意：unless和if引导条件状语从句时，从句常用一般现在时表示将来，而主句则用一般将来时，即遵循“主将从现”原则。
二、as soon as引导的时间状语从句
as soon as意为“一……就……”，表示从句和主句的动作先后发生，间隔短暂。
The students became quiet as soon as the teacher came in. 老师一进来，学生们就安静下来了。
注意：as soon as可表示将来的事，这时主句用一般将来时，从句常用一般现在时，即遵循“主将从现”原则。
You
三、so... that...引导的结果状语从句
so... that...意为“如此……以至于……”，引导结果状语从句。常见于以下四种结构：
（1） so+形容词/副词+that从句。
He ran so fast that we couldn
（2） so+形容词+a / an+单数名词+that从句。
It is so interesting a book that I want to read it again. 这本书如此有趣，我还想再读一遍。
（3） so+many / few+复数名词+that从句。
He has so few friends that he often feels lonely. 他朋友很少，所以他经常感到孤独。
（4） so+much / little+不可数名词+that从句。
There was so much work to do that everybody got bored. 有这么多的事要做，人人都感到厌烦了。
注意：such... that...意为“如此……以至于……”，也可以引导结果状语从句，但such修饰的是名词。
They are such good students that the teacher likes them. 他们都是很好的学生，所以老师喜欢他们。
四、so... that... / unless / as soon as句型改写考点
（1） so... that...
so... that...引导结果状语从句，当that后面接否定句时，可以与“too... to... （太……而不能……）”结构互换。
He was so angry that he couldn
=He was too angry to say a word.
拓展：在so... that...句型中，当主句的主语与that引导的从句的主语一致时，“ so... that+肯定句”句型可与“enough to...”句型互換;“ so... that+否定句”句型可与“too... to...”句型互换。
He was so clever that he could understand what I said. 他很聪明，能听懂我说的话。
=He was clever enough to understand what I said.
The girl is so young that she can
=The girl is too young to dress herself.
（2） unless
unless意为“如果不……;除非”，引导条件状语从句，相当于if条件状语从句的否定形式，即unless=if... not。
Unless you put on your raincoat you
=If you don
（3） as soon as
as soon as意为“一……就……”，其中的从句通常用一般现在时表示将来。可以用于口语和书面语中。它在句中的位置比较灵活，而且可以用于各种时态。
I
As soon as I went in， Tom cried out with pleasure. 我一进去，汤姆就高兴地叫了起来。（一般过去时）
as soon as可以用the minute 来改写。
As soon as I went in， Tom cried out with pleasure. =The minute I went in， Tom cried out with pleasure.
【趁热打铁】
一、单项选择。
1. They will lose the game ______ they try their best.
A. unless B. once C. since D. after
2. —The air pollution is terrible.
—It will be worse ______ we take actions to protect the environment.
A. if B. unless C. until D. when
3. In summer milk quickly goes bad ______ it is put into a fridge.
A. though B. unless
C. because D. once
4. —When will you return the book to me？
—I
A. once B. until C. as soon as D. unless
5. Prince George is ______ lovely that many people like him very much.
A. very B. such C. as D. so
二、選用方框中所给的连词填空。
so... that...， unless， as soon as
1. Teresa is ______ nervous ______ she can
2. —Your aunt often walks the dog in the morning.
—Yeah， ______ bad weather stops her.
3. Learning to write is learning to think. You don
4. I
5. I worked ______ hard ______ I got the first place.
6. Please remember to call me ______ you get home， Lisa.
7. You won
8. I will tell you ______ I arrive.
9. Mr. Green enjoys fresh air and he always sleeps with the window open ______ it is really cold.
10. The animals were ______ lovely ______ I spent a whole day in the zoo.
三、同义句转换，每空一词。
1. Tom will call you when he gets there.
Tom will call you ______ ______ ______ he gets there.
2. If it isn
They will go on a picnic tomorrow ______ it is snowy.
3. He is too weak to carry the box.
He is ______ ______ ______ he can
4. The movie is so exciting that all of us want to see it again.
It is ______ ______ ______ movie that all of us want to see it again.
5. She is too young to do the work.
She is ______ ______ ______ she can