引導(dǎo)名詞性從句的連接詞

 引導(dǎo)名詞性從句的連接詞可分爲(wèi)三類： 連接詞：that,whether,if 不充儅從句的任何成分） 連接代詞：what, whatever, who, whoever, whom,whose, which. 連接副詞：when, where, how, why

不可省略的連詞： 1. 介詞後的連詞 2. 引導(dǎo)主語從句和同位語從句的連詞不可省略。 That she was chosen made us very happy. We heard the news that our team had won.

比較：whether與if 均爲(wèi)"是否"的意思。 但在下列情況下，whether 不能被if 取代： 1. whether引導(dǎo)主語從句竝在句首 2. 引導(dǎo)表語從句 3. whether從句作介詞賓語 4. 從句後有"or not" Whether he will come is not clear.

大部分連接詞引導(dǎo)的主語從句都可以置於句末，用 it充儅形式主語。 It is not important who will go. It is still unknown which team will win the match.