as引导定语从句时的特殊用法

as引导定语从句时的特殊用法

关系代词as既可以引导限制性定语从句，也可以引导非限制性定语从句。as可以在从句中作主语、宾语或表语。

1. as引导限制性定语从句

as引导限制性定语从句， 置于先行词之后，与其词义关系密切，不可分割。如：

He is such a good boy as everyone likes.他是大家都喜欢的好孩子。

Such machines as are used in our workshop are made in China.我们车间使用的机器是中国制造的。

as 常见搭配：

1）

such+（不定冠词+）名词+as引导的定语从句，意思是“像……一样的”。如：

The little boy realized that there was no such a tank as he dreamed of after he got to the museum.

那个小男孩儿到了博物馆后才知道没有他所想象的那种坦克。

2）

the same+名词+as引导的定语从句，意思是“同一类事/物”。如：

Lao Li bought the same computer as I did.

老李买的电脑跟我买的一模一样。

1.

as引导非限制性定语从句

as引导的非限制性定语从句，既可以放在主语之前，也可以放在主语之后。通常用于下列句型：as is know to all，as is said，as is reported，as is announced，as we know，as I expected如：

As I expected, he got the first place again in this mid-term examination.

正如我所预料的那样，他在这次期中考试中又得了第一名。

2.

as引导非限制性定语从句时与which的区别

1）

当非限制性定语从句置于主语之前时，只能用as。如：

As is known to us, the moon travels round the earth.

2）

从句置于主语之后，且从句有否定词或表示否定意义时，只能用which。如：

Tom was late for school this morning, which was unexpected.

汤姆今天迟到了，这让人觉得意外。

He drinks a lot every day, which his wife doesn’t like at all.

每天他都喝很多酒，他的妻子一点都不喜欢他这样。

3) 非限定性定语从句中出现expect , think , suppose 等表示猜测、想象、预料等时，只能用as

She succeeded in her doing the research work , as we expected .

4)固定搭配：such/the same+as

Exercises:

1. The British are not familiar with different cultures and other ways of doing things, ________is often the case in other countries.

2. A) as B) what C) so D) that

2. ________might be expected, the response to the question was very mixed.

A) As B) That C) It D) What

3. I hope all the precautions against air pollution, ________suggested by the local government, will be seriously considered here.

A) after B) while

C) as D) since

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