引導(dǎo)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(dǎo)從句，而不能引導(dǎo)詞或者詞組。從屬連詞一般可以引導(dǎo)名詞性從句和狀語從句。
引導(dǎo)名詞性從句的從屬連詞
1) that 引導(dǎo)賓語從句或間接引語時(shí)，可省略。引導(dǎo)主語從句時(shí)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(dòng)詞不定式前 I don’t know whether to accept his advice.
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