高中英語語法中有三座大山：定語從句，名詞性從句和狀語從句。
我們之前講過定語從句和名詞性從句的用法。今天主要來講一講狀語從句。
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我們從以下幾個方面來講解狀語從句：
- 什麼是狀語從句？
狀語是用來修飾動詞、形容詞、副詞或者句子的一種句子成分。它可以表示時間、地點、原因、目的、結果、條件、讓步、比較、方式等。當充當狀語的部分是一個句子時，也就是狀語從句。
- 狀語從句分為幾類？
狀語從句一共有9類：
1. 時間狀語從句；2. 地點狀語從句；3. 原因狀語從句；4. 條件狀語從句；5. 讓步狀語從句；6. 目的狀語從句；7. 結果狀語從句；8. 方式狀語從句；9. 比較狀語從句。其中最常用的是時間狀語從句。
- 時間狀語從句的引導詞：時間狀語從句引導詞分為兩部分：
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…
- 地點狀語從句引導詞：
地點狀語從句用連接副詞 where或wherever (在任何地方) 引導。
- 原因狀語從句引導詞：
because, as, since, now that, for,和considering that, seeing that 這七個連詞都用於表示表示原因, 但在語氣上一個比一個弱。
- 條件狀語從句的引導詞：
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。
- 讓步狀語從句引導詞：
引導詞：though, although, even if, even though,no matter + 疑問詞(what/ who/ where/ when/ which/ how)，疑問詞-ever (whatever, whoever, wherever, whenever, however, whichever)
- 目的狀語從句引導詞：
in order that …，so that，for fear that; in case; lest (以免)等。
- 結果狀語從句引導詞：
so, so … that, such … that; so that 等
- 方式狀語從句引導詞：
as, just as, as if, as though, the way (that), in the way (that)等
- 比較狀語從句引導詞：
as …as, not so / as … as, more…than, less … than, the more + adj. / adv., the more + adj. / adv.
- 特殊用法：as用在不同的狀語從句中意義不同：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.
- 部分狀語從句可使用省略形式：
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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