条件状语从句用if, unless, as/so long as, on condition that, provided, providing, now that, in that等引导。除了应注意这些词的语义差别之外，还需注意，在条件状语从句中不能用将来时，只能用一般现在时表示一般将来时。例如：
If China becomes strong and powerful, we’ll never bully other countries.
As long as we don’t lose heart, we’ll turn our dreams into realities.
He won’t believe anything unless he sees it with his own eyes.
I will lend you the money on condition that you pay it back in one month.
有时if条件句中也用will,但此时用来表示主语的意愿。例如：
If you will come to work in our city, I’ll try my best to meet your demands.(如果你愿意来我市工作，我将尽力满足你的要求。)
八．方式状语从句
1．方式状语从句用as, just as, as if, as though引导。
2.关于方式状语从句值得注意两点：
（1）as表示行为方式；
（2）在打比方与事实相反或不可能实现时，as if /though引导的从句用虚拟语气。但当句子谓语为过去时态时，特别是当句子谓语为look, seem, taste, smell等感官动词时，从句谓语动词不用虚拟语气。例如：
I have changed the plan as you suggested.
When at Rome do as the Romans do.(入乡随俗)
I have loved you as if you were my own son.
It looks as if it is going to rain.
九．比较状语从句
比较状语从句常由than, as…as , not so/as…as, the more…, the more …等引导。例如：
He didn’t do as much as he had promised.
I know you as well as any member of your family.
Now we can produce much more steel than Japan.
The longer you stay with him, the better you will know him.
状语从句的复习重点及中考热点透视：
状语从句不仅是初中英语学习的重点，而且也是每年中考必考的内容之一。从九大状语从句来看，同学们应将复习重点放在时间状语从句、条件状语从句、结果状语从句和比较状语从句这四种上。
一、对时间状语从句的考查
1．要点：
1）引导时间状语从句的连词有：while，when，as，as soon as，until，not．．．until，before，after，since，etc．要掌握每个连词的含义及其用法，还有它们之间的一些区别。
2）when，while，as的区别：
①三者均可表示“当……的时候”，如果主句表示的是短暂的动作，而从句表示的是一段时间，三者可通用。如：
I met Kang Li as／when／while I was walking along the street．当我沿街散步时碰见了康丽。
②as和when都可与终止性动词连用，while只能与延续性动词连用。如：
It was snowing when we got to the airport．当我们到达机场时，天正下着雪。（不能用while）
③as强调主句与从句表示的动作同时发生；while强调主句表示的动作持续于while所指的整个时间内；when可指主、从句所述动作同时或先后发生。如：
He sang as he went along．他边走边唱。
Please write while I read．我读的时候，请写下来。
When he reached home，he had a little rest．回到家后，他休息了一会儿。
3）until和till在肯定句中表示“直到……为止”，主句要用延续性动词；在否定句中，表示“直到……才”，主句常用终止性动词，这时till和until可用before替换。如：
I waited till／until he arrived．我一直等到他到来。
We won't start until／till／before Bob comes．鲍勃到来之前，我们不会动身。
4）since从句中常用过去时，主句用一般现在时或现在完成时；如果主句是一般将来时，情态动词加动词原形或祈使句时，时间状语从句用一般现在时。如：
Where have you been since I saw you last？上次我和你见面之后，你到哪里去了？
I'll phone you as soon as I arrive in Tonghua．我一到通化就给你打电话。
2．考例：（所有考例取自2001、2002年全国各省市中考英语试题）
1）我一到美国就给你打电话。（北京市海淀区）
I'll ring you up ______soon ______ I get to America．
2）昨天直到雨停了，孩子们才离开学校。（同上）
The children ______ leave school ______ the rain stopped yesterday．
3）It ______ ten years since they ______ to France．（河北）
A．as；covered
B．was；have moved
C．is；have moved
D．is；moved
4）He ______ wait until the rain ______．（南京市）
A．won't；will stop
B．won't；stop
C．will；stops
D．will；will stop
二、对条件状语从句的考查
1．要点：引导条件状语从句的连词有if（如果）、unless（除非）等，unless在意义上相当于if．．．not。条件状语从句也像时间状语从句一样，如果主句用将来时，从句要用现在时代替将来时。如：
You will fail unless you study hard．（＝You will fail if you don't study hard．）除非你努力学习，否则你会失败。
2．考例：
1）He will go to the Great Wall if it ______ tomorrow．（北京市宣武区）
A．won't rain
B．doesn't rain
C．don't rain
D．isn't raining
2）______you eat old food，you may be ill．（湖南）
A．Before B．Why C．If D．Which
三、对比较状语从句的考查
1．要点：引导比较状语从句的连词有as．．．as，than。
1）表示甲与乙在某一方面相同时，用“as＋原级＋as”句型；表示甲在某一方面不如乙时，用“not as／so＋原级＋as”句型。如：
Dalian is as beautiful as Shenzhen．大连和深圳一样的美。
I don't run as／so fast as Kang Li．我不如康丽跑得快。
2）表示甲超过或不及乙时，用“比较级＋从句”（从句中常省略意义与主句相同的部分）。如：
He runs faster than you（do）．他跑得比你快。
Today is less cold than yesterday．今天没有昨天冷。
2．考例：
1）Jack runs as ______ as Tom．（北京市宣武区）
A．fast
B．faster
C．fastest
D．much faster
2）30，000dollars is a large amount of money，but it's ______ than we need．（上海市）
A．for more
B．very much
C．far less
D．very little
四、对结果状语从句的考查
1．要点：引导结果状语从句的连词有so…that（如此……以致于），such…that（如此……以致于）等。常用句型：
so＋形容词／副词＋that从句
such a／an＋形容词＋单数可数名词＋that从句
such＋形容词＋复数可数名词／不可数名词＋that从句
so＋形容词＋a／an＋单数可数名词＋that从句
He spoke so fast that I couldn't follow him．他讲得太快，我跟不上。
He told us such funny stories that we all laughed．
他给我们讲了那么多有趣的故事，我们全都哈哈大笑。
2．考例：
1）这山太高，我们很难到达山顶。（四川）
This mountain is ______ ______ that we can ______ ______ the top．
2）Miss Gao asked a question，but it was ______that nobody could answer it．
A．very difficult
B．too difficult
C．difficult enough
D．so difficult
五、对其它状语从句的考查
还有五种状语从句：地点状语从句、原因状语从句、目的状语从句、方式状语从句、让步状语从句。
1．要点：
1）掌握常用的引导词：
①引导地点状语从句的有：where（在哪里），wherever（无论何地），etc．如：
Where there is a will，there is a way．有志者，事竞成。
Wherever you go，I go too．无论你去哪里，我都去。
②引导原因状语从句的有because，as，since（因为），etc。because常回答why引导的疑问句，该从句一般位于主句后；since比as正式，两者不回答why引导的问句，而且其从句一般放在句首。如：
—Why can't I go？为什么我不能去？
—Because you're too young．因为你年纪太小了。
As（Since）you are not feeling well，you'd better stay at home．既然你不太舒服，还是留在家里的好。
③引导目的状语从句的有so that（以便）等。如：
I packed him a little food so that he wouldn't be hungry．
我给他包了一点食物，让他不致挨饿。
④引导方式状语从句的有as（按照）等。如：
I will do it as you tell me．我将照你说的做。
⑤引导让步状语从句的有though／although（虽然），even though（尽管），whoever／no matter who（无论谁），however／no matter how（无论怎样），whatever／no matter what（无论什么）等。如：
Though it's hard work，I enjoy it．尽管这工作很辛苦，我还是很喜欢。
No matter how hard the work was，he never gave it up．不管工作多么艰难，他都从不放弃。
2）because不能与并列连词so，though／although不能与but同时在句中使用。如：
She was late for schoolbecauseshe missed the bus．
She missed the bus，soshe was late for school．
It's not cheap，butit's very good．
Though it's not cheap，it's very good．
2．考例：
1）I can't understand this passage _____there are no new words in it．（安徽）
A．if
B．because
C．though
D．and
2）“Why did Li Lei use a pencil？”“ _____his pen was broken．”（福州市）
A．Because
B．When
C．Until
D．If
六、对状语从句和宾语从句、简单句、并列句的混合考查
【考点1】区分when，if引导宾语从句和状语从句的不同：when引导时间状语从句意为“当……时候”，引导宾语从句意为“什么时候”；if引导条件状语从句意为“如果”，引导宾语从句意为“是否”。如：
1．—Mike wants to know if _____ a picnic tomorrow．
—Yes．But if it _____，we'll visit the museum instead．（河北）
A．you have；will rain
B．you will have；will rain
C．you will have；rains
D．will you have；rains
2．—Do you know when he _____ back tomorrow？
—Sorry，I don't．When he _____ back，I'll tell you．（安徽）
A．comes；comes
B．comes；will come
C．will come；comes
D．will come；will come
【考点2】状语从句和宾语从句、状语从句和简单句、并列句的同义转换。如：
1．A：He is too young to go to school．
B：He is _____young _____ he can't go to school．（四川）
2．A：Tom is the tallest in his class．
B：Tom is _____ _____ any other student in his class．（四川）
3．A：The box is so light _____ that the boy can carry it．
B：The box is light for the boy to carry．（南京）
4．A：Put on your coat，or you'll catch a cold．
B：_____you _____ put on your coat，you'll catch a cold．（上海）
Key:
状语从句的复习重点及中考热点透视
一、2．1）as；as 2）didn't；until／till／before 3）D 4）C
二、2．1）B2）C
三、2．1）A2）C
四、2．1）so high；not reach 2）D
五、2．1）C 2）A
六、【考点1】1．C 2．C【考点2】1．so；that 2．taller than 3．enough 4．If；don't
