中考英語知識點：引導名詞性從句的從屬連詞

從屬連詞不同與并列連詞，只能用來引導從句，而不能引導詞或者詞組。從屬連詞一般可以引導名詞性從句和狀語從句。

引導名詞性從句的從屬連詞

1) that 引導賓語從句或間接引語時，可省略。引導主語從句時不可以省略。

He said (that) he would come. 賓語從句

His mother told me (that) he is a good boy. 間接引語

That she is still alive is true. 主語從句

2) if/whether 是否

I wonder if he is at home.

I ask him whether he would come.

注意：只可以用whether的情況

介詞后面 It will depend on whether it rains tomorrow.

whether···or not 固定搭配 Let me know whether you come or not.

動詞不定式前 I don’t know whether to accept his advice.

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