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        在句子中擔當主語的從句就叫做主語從句,通常放在主句謂語動詞之前或由形式主語it代替,而本身放在句子末尾。其使用陳述語序,通常結構為“引導詞 + 主語 + 謂語 + 其他成分", 但當連接代詞同時充當從句主語時,其結構為“連接代詞 + 謂語 + 其他成分”。

        一. 概念:在句子中擔當主語的從句就叫做主語從句,通常放在主句謂語動詞之前或由形式主語it代替,而本身放在句子末尾。

        主語從句使用陳述語序,其通常結構為“引導詞 + 主語 + 謂語 + 其他成分", 但當連接代詞同時充當從句主語時,其結構為“連接代詞 + 謂語 + 其他成分”。

        二. 引導詞:

        1. that引導

        eg. That you are coming to London is the best news I have heard this long time.

        2. whether引導

        eg. Whether they would come to conference was a question.

        3. 連接代詞引導: who,whom, whose, what, which, whoever, whomever, whichever, whatever

        eg. Whoever is top from wins the game when two matched players meet.

        4. 連接副詞引導: therefore, besides, otherwise, however, moreover, still, thus, meanwhile

        eg. How this happended is not clear to anyone.

        5. 關系代詞型what引導

        eg. What shoked me was that she never wash her own clothes.

        三. 形式主語it:

        1. 對關系代詞型what引導的主語從句,可以使用形式主語。

        eg. It is clear enough what he meant.

        2. 如果句子是疑問句,則必須用帶形式主語it的結構.

        eg. Is it true that all of us need to to conference?