①，结果状语从句:
一般常见连接词:常由so that、so… that 、 such…that引导
注意点:
① 当so...that引导结果状语从句时，so的后面只能跟形容词或者副词。
eg: She worked so hard that she passed the interview.
② 当such...that引导结果状语从句时，such的后面只能跟名词或名词短语。
eg: It is such an interesting book that I want to see it again
③ 当名词被表示数量的many、much、few、little等修饰时，连接词要用so...that
eg: There are so many people in the hall that its hard for me to find him
④ 结果状语从句中，such+a/an+形容词+名词=so+形容词+a/an+名词
eg: Jenny is such a clever girl that all of us like her very much.
意思等同于：Jenny is so clever a girl that all of us like her very much.
②，比较状语从句:
一般常见连接词:as、than、the more...the more、
注意点:
① 比较状语从句一般分为同级之间的比较和不同级之间的比较。
同级之间比较用as，不同级之间比较用than。
eg: He is as strong as an ox.
The test is more difficult than I expected it to be.
② as和than引导的比较状语从句中，通常会出现从句省去和主句相同部分的情况。
eg: She has passed the test earlier than (it has been) expected.
③，方式状语从句:
一般常见连接词:as、as if、the way、as though等
时态
由as if、 as though引导的从句，时态取决于说话者对所谈内容的态度。
注意点:
① as if 和as theough引导方式状语从句的时候，用虚拟语气。
虚拟语气表示一种假设，是说话者的主观意愿或者猜想。
eg: If I were a fish， I would be able to swim in the river.
② 方式状语从句中有一种固定的句型：As A is to B，so C is to D。
eg: As water is to fish， so air is to bird.
④，目的状语从句:
一般常见连接词:so that、in order that、in case等
时态:
目的状语从句一般都是用以补充主句中的谓语动词发生的目的。
由于目的都是未来的行为，所以从句中一般用表示未来可能性的时态。
注意点:
① 目的状语从句中常会出现may、can、should、would等情态动词。
② in order to 后接动词原型，叫目的状语。而in order that 后接从句，作目的状语从句。
eg: We used the computer in order that we can save time.
We used the computer to save time.
③ in order that 和 so that 的区别在于：so that不可以位于句首，而in order that 可以。
另外，so as to也不可以位于句首。
eg: In order that I could be in time for the test， I got up early.
⑤，让步状语从句:
一般常见连接词:though、although、even if、as、while、even though、no matter等
时态:
让步状语从句遵从“主将从现”的时态规则，这里的“现”不仅仅指一般现在时，也有时候是现在完成时。
注意点:
① 一般情况，although和though可以互换。其中，although多位于句首。
② although，though不能与but连用，但是可以与yet，still，nevertheless连用。
yet常出现在否定句或者疑问句中。
eg: Although she treats me ，yet I will trust her.
③ as引导让步状语从句的时候，句子常作倒装形式。
eg: Queen as she is ，she is unhappy.
④ while引导让步状语从句时，只能放于句首，意思和although一致。
eg: While she loves her son， she is strict to him.
⑤ 当用whether...or...来连接让步状语从句时，前后所说必须是两个相反的事物。
eg: Whether he passes or fails， this is his last chance.
