大學英語四六級考試必備語法從句

　　I 定語從句

1. 先行詞為all, anything, something, nothing, everything, much, little, none等不定代詞時，關係代詞一般只用that，不用which。在大多數情況下that可以省略.

Please tell me everything you know about the matter.

Thats all we can do at the moment.

2. as引出的限制性定語從句

在such as的.結構中as可作關係代詞，引出限制性定語從句。有時和same連用，在從句中可作主語、賓語或表語等。

Such people as were recommended by him were reliable.

Ive never seen such a talented young man as he is.

I have the same trouble as you .

3. as引出的非限制性定語從句

as可作關係代詞引出非限制性定語從句，代替整個主句，通常譯為如一樣，象一樣等。as引導的從句一般用逗號與主句隔開，可以位於主句的前面、中間或後面.

I live a long way from work, as you know.

She did not, as her friend had feared, break down.

As is generally accepted, economic growth is determined by the smooth development of production.

4. 分隔式定語從句

定語從句一般緊跟在先行詞之後，但有時會被其他句子成分與先行詞隔開，從而構成分隔式定語從句。