一、地点状语从句。
地点状语从句通常由where, wherever 引导。
where there is a will, there is a way.
wherever you go，i'm right here waiting for you.
二、方式状语从句。
方式状语从句通常由as, (just)as...so...as if, as though引导。
引导的方式状语从句通常位于主句后，但当(just)as...so...结构位于句首时，as从句带有比喻的含义，意思是“正如；就像”，多用于正式文体。
always do to the others as you would be done by.
as water is to fish, so air is to man.
just as we sweep our rooms, so we should sweep backward ideas from our minds.
if, as though
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反；有时也用陈述语气，表示所说情况是事实或实现的可能性较大。译作“仿佛……似的；好像……似的”。
they completely ignore these facts as if (as though)they never existed.
he looks as if ( as though)he had been hit by lighting.
it looks as if the weather may pick up very soon.
三、原因状语从句。
比较because, since, as和for的用法：
语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知的，就用as或since。
i didn't go, because i was afraid.
since / as the weather is so bad, we h**e to delay our journey.
2.由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。如果不是说明直接原因，而是多种情况加以推断，就只能用for。
he is absent today, because / for he is ill.
he must be ill, for he is absent today. 四、目的状语从句。
表示目的状语的从句可以由 so that, in order that, lest, for fear that, in case等词引导。
you must speak louder so that / in order that you can be heard by all.
he wrote the name down for fear that(lest)he should forget it.
better take more clothes in case the weather is cold.
五、结果状语从句。
结果状语从句常由so...that 或 such...that引导。so...that与s uch...that之间可以转换。
the boy is so young that he can't go to school.
he is such a young boy that he can't go to school.
六、条件状语从句。
连接词主要有 if, unless, as / so long as, on condition that等。
let's go out for a walk unless you are too tired.
if you are not too tired, let's go out for a walk.
七、让步状语从句。
although引导的让步状语从句，后面的从句不能有but，但是 though 和yet可连用。
although it's raining, they are still working in the field.
he is very old, but he still works very hard.
though the sore is healed, yet a scar may remain.
though 引导的让步从句必须将表语或状语提前(形容词、副词、分词、实义动词原形提前)。
child as / though he was, he knew what was the right thing to do.
if, even though“即使”。
we'll make a trip even though the weather is bad.
不管……都”。
whether you believe it or not, it is true.
5.“no matter +疑问词”或“疑问词+-ever”。
no matter what happened, he would not mind. =whatever happened, he would not mind.
高考对状语从句的考查主要体现在省略，时态的替代，语序的倒装以及连词的辨析四个方面。1.成分的省略。
(1)在时间、地点、条件、让步、方式等状语从句中，如果主语是it或与主句的主语一致，且谓语动词含有be时，可把从句的主语和be一起省略。
don't speak until (you are) spoken to.
do come to see me whenever (it is) possible.
(2)在比较状语从句中，可省略与主句相同的部分。
i know you more than he (knows you).
tom is two years older than alice (is).
(3)as (尽管)引导让步状语从句倒装时，表语提前，且其前的冠词要省略。
hero as he is, he has shortcomings.
2.时态的替代。
(1)在时间、条件和让步状语从句中须用一般现在时替代一般将来时，用一般过去时替代过去将来时。
if it rains tomorrow, we won't go fishing.
don't get off the bus until it has stopped.
(2)the more...the more...句型中，前句起条件状语从句作用，故用现在时表将来。
the harder you work, the greater progress you'll make.
(3)after, before, as soon as等连词本身就暗示了时间的先后，因此可用一般过去时代替过去完成时，而不会产生时间上的混乱。
i went to bed after i (had) finished my homework.
the film star (had) left before the reporter arrived.
he got down to work as soon as he (had) go to the factory.
3.语序的倒装。
(1)no sooner...than...hardly / scarcely / barely...
when...句型中的主句常用过去完成时，从句常用一般过去时，且置于句首时主句要倒装。
no sooner had he got home than it began to rain.
(2)so / such...that...not until...置于句首时主句要倒装。
so angry did she feel that she couldn't speak.
not until he told me the truth did i realize what had happened.
4.连词的辨析。根据上下文的语意推断属于哪种状语从句，然后选择连词。
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