表語從句的用法

表語從句

在復合句中作表語的從句叫表語從句。引導表語從句的關聯(lián)詞與引導主語從句的關聯(lián)詞大致一樣，表語從句位于連系動詞后，一般結構是“主語+連系動詞+表語從句”?？梢越颖碚Z從句的連系動詞有：be, look, remain, seem等。注意：關聯(lián)詞不能省略，并且從句用陳述語序。例如：

The fact is that we have lost the game. That is why he didn't come to the meeting.

需要注意的，當主語是reason時，表語從句要用that引導而不是because。但是reason 后面的定語從句可以用why 或that引導。例如：The reason why he was late was that he missed the train by one minute this morning

【附加】在名詞性從句中that與what的區(qū)別:

that在名詞性從句中不充當句子成分,只起連接作用，沒有意義，不能省略（在賓語從句中能省略）。

如：That they are good at English is known to us all.

The problem is that we don't have enough money.

what在名詞性從句中充當句子成分，起連接作用，有意義，不能省略。what可以分解成定語從句中的先行詞 + 關系代詞+ that。理解為雙重身份。

如：Do what he says. What (=The thing that) he said was true.