高中英语语法中有三座大山：定语从句，名词性从句和状语从句。
我们之前讲过定语从句和名词性从句的用法。今天主要来讲一讲状语从句。
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我们从以下几个方面来讲解状语从句：
- 什么是状语从句？
状语是用来修饰动词、形容词、副词或者句子的一种句子成分。它可以表示时间、地点、原因、目的、结果、条件、让步、比较、方式等。当充当状语的部分是一个句子时，也就是状语从句。
- 状语从句分为几类？
状语从句一共有9类：
1. 时间状语从句；2. 地点状语从句；3. 原因状语从句；4. 条件状语从句；5. 让步状语从句；6. 目的状语从句；7. 结果状语从句；8. 方式状语从句；9. 比较状语从句。其中最常用的是时间状语从句。
- 时间状语从句的引导词：时间状语从句引导词分为两部分：
as，while ，when ， whenever ，before ， after ， until (till) ，since ， as soon as，every time，next time，the first/…time，the moment，the minute/…，instantly，immediately，directly (一…就…)
no sooner… than…, hardly/ scarcely/ barely…when…
- 地点状语从句引导词：
地点状语从句用连接副词 where或wherever (在任何地方) 引导。
- 原因状语从句引导词：
because, as, since, now that, for,和considering that, seeing that 这七个连词都用于表示表示原因, 但在语气上一个比一个弱。
- 条件状语从句的引导词：
if, unless (除非), as / so long as (只要), on condition (只要), once ( 一旦), in case (假使) , providing / provided (that) 等。
- 让步状语从句引导词：
引导词：though, although, even if, even though,no matter + 疑问词(what/ who/ where/ when/ which/ how)，疑问词-ever (whatever, whoever, wherever, whenever, however, whichever)
- 目的状语从句引导词：
in order that …，so that，for fear that; in case; lest (以免)等。
- 结果状语从句引导词：
so, so … that, such … that; so that 等
- 方式状语从句引导词：
as, just as, as if, as though, the way (that), in the way (that)等
- 比较状语从句引导词：
as …as, not so / as … as, more…than, less … than, the more + adj. / adv., the more + adj. / adv.
- 特殊用法：as用在不同的状语从句中意义不同：比如：
1. She sang as she worked.
2. Smart as he is ,he doesn’t study hard.
3. You must try to do as I did.
4. She doesn’t do her work as carefully as I.
5. As she was late for class, she had to say sorry.
- 部分状语从句可使用省略形式：
even if, if , once, while, though, unless, when, as if etc.
1.The flower his friends gave him will die unless (it is) watered every day..
2.Even if (I am) invited, I won’t go there.
3.Once (you are) caught sleeping in class, you’ll be punished by your head-teacher .
4.Though (he was) surprised to see us, he gave us a warm welcome.
5.She won’t speak to anyone unless (she is) asked to.
6.When (it is) compared with the old one, our new house is really like a palace.
7.These young man volunteered to go wherever (they are) needed.
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