摘要：结构：通常结构为“引导词 + 主语 + 谓语 + 其他成分"。用法：1、that引导。2、whether引导。3、连接代词引导: who,whom, whose, what, which...
结构：通常结构为“引导词 + 主语 + 谓语 + 其他成分"。用法：1、that引导。2、whether引导。3、连接代词引导: who,whom, whose, what, which, whoever, whomever, whichever, whatever。4、连接副词引导: therefore, besides, otherwise, however, moreover, still, thus, meanwhile。5、关系代词型what引导。
主语从句结构及用法
在句子中担当主语的从句就叫做主语从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。通常结构为“引导词 + 主语 + 谓语 + 其他成分"。
that引导
eg：That you are coming to London is the best news I have heard this long time.
whether引导
eg：Whether they would come to conference was a question.
连接代词引导: who,whom, whose, what, which, whoever, whomever, whichever, whatever。
eg：Whoever is top from wins the game when two matched players meet.
连接副词引导: therefore, besides, otherwise, however, moreover, still, thus, meanwhile。
eg：How this happended is not clear to anyone.
关系代词型what引导
eg：What shoked me was that she never wash her own clothes.
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