語法復習六：狀語從句
if he had come a few minutes earlier, he could have seen her.
（七）讓步狀語從句
讓步狀語從句可由although, though, as, even if (though), however, whatever, whether … or, no matter who (when, what, …) 等引導。注意：as引導的讓步狀語從句一般是倒裝的。
e.g. though he is a child, he knows a lot.
child as he is, he knows a lot.
whatever ( = no matter what ) you say, i’ll never change my mind.
（八）方式狀語從句
方式狀語從句常由as, as if (though), the way, rather than等引導。
e.g. you must do the exercise as i show you.
he acted as if nothing had happened.
（九）比較狀語從句
比較狀語從句常用than, so (as) … as, the more … the more等引導。
e.g. i have made a lot more mistakes than you have.
he smokes cigarettes as expensive as he can afford.
the busier he is, the happier he feels.
（十）使用狀語從句時要注意的幾個問題
1、在時間和條件（有時也在方式、讓步等）從句中，主句是一般將來時，從句通常用一般現在時表示將來。
e.g. we’ll go outing if it doesn’t rain tomorrow.
i’ll write to you as soon as i get to shanghai.
2、有些時間、地點、條件、方式或讓步從句，如果從句的主語與主句主語一致（或雖不一致，是it），從句的謂語又包含動詞be ，就可省略從句中的“主語 + be”部分。
e.g. when (he was) still a boy of ten, he had to work day and night.
if (you are) asked you may come in.
if (it is) necessary i’ll explain to you again.
3、注意區分不同從句：引導的是什么從句，不僅要根據連詞，還要根據句子結構和句意來判別。以where為例，能引導多種從句。
e.g. you are to find it where you left it.（地點狀語從句）
tell me the address where he lives.（定語從句，句中有先行詞）
i don’t know where he came from.（賓語從句）
where he has gone is not known yet.（主語從句）
this place is where they once hid.（表語從句）
練習、狀語從句
一、用橫線劃出下列句子中的狀語從句，并指出是哪種狀語從句：
1. child as she is, she knows a lot of things.
2. the more i can do for the class, the happier i’ll be.
3. he talks as if (as though) he knew all about it.
4. he is such a good teacher that the students love and respect him.
5.i shall go to the park unless it rains.
6. no sooner had i got home than it began to rain.
7. where there is water, there is life.
8. he studied hard so that he could catch up with his classmates.
9. since you are very busy, i won't trouble you.
10. even if (though) i fail. i’ll never lose heart.
11. once you begin the work, you must continue.