状语从句(含练习与答案)(2)

引导词有because, since, as, now(that) (既然)

回答以why提出的问题时，只能用because。

since＝now (that), 表“既然”意，表示已知的或明显的原因。

Now that/Since you are free today, you may have a rest at home or go out for a walk.

for 是一个并列连词，用来连接两个并列句，引导的句子是对前面一句话的内容的推测或补充说明。

It must have rained last night, for the ground is wet.

The day has broken, for the birds are singing. (这两句中的for不可替换)

四、目的状语

引导词有so that, in order that, that, in case（免得，以防）。目的状语从句的谓语常含有can/could/may/might/will/would等情态动词。

He ran as fast as possible in order that he could catch the bus.

Please remind me of it again tomorrow in case I forget.

五、方式（或比较）状语从句

引导词有as, as if, as though, the way, than, as/so…as, the more…the more.

It looks as if it is going to rain.

My teacher treats us as if she were our mother.

Sometimes we teach our children the way our parents have taught us.

Tom is not so/as tall as John.

He runs faster than I.

注：as…as可用于肯定句或否定句，so…as只能用于否定句。

六、结果状语从句

引导词有so…that, such…that, so that.（意思是“如此…以致…）

He works so hard that he makes great progress in his studies.

It’s such a difficult problem that nobody can work it out.（从句不是目的，没有can, may） There’s not any noise here so that I feel very comfortable.

※ 修饰形容词、副词只能用so.

He walked so fast that I couldn’t keep up with him.

※ 修饰many, much, few, little (少) 时，习惯用so.

There were so many books in the shop that he didn’t know which to buy.

※ 修饰可数名词单数可用so或such

It is such an interesting book (= so interesting a book) that we all like it very much.

※修饰不可数名词或可数名词复数时，用such.

The villagers were such kind people that they all came to help us.

七、条件状语从句

引导词有if, unless, as/so long as, on condition that, in case（万一，如果），从句的时态用一般现在时（含现在完成时），一般过去时（含过去完成时）分别代替一般将来时和过去将来时。

If it rains tomorrow, I won’t go there.

He said he would not go back home unless he had achieved a lot.

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