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名词从句 讲五个问题： 一、名词从句的本质。 1. 概念：就是把一个完整的句子当一个名词来使用。那么从句就具备了名词所具备的所有性质。主语、宾语、表语、同位语。 2. 引导名词从句常用的连词。有三类：1)that; 2)whether,if; 3)when,where ,how等连接副词或what,who,whose等连接代词。 That引导的名词性从句不能做任何句子成分。what一定在从句中充当主语或者宾语。Which 和whose 后面必须接名词。例如： Concerns were raised __witness might be encouraged to exaggerate their stories in court to ensure guilty verdicts. A.what B.when C.which D.that 3)多重的名词从句现象。例如： I realized that what I said was not exactly what meant to say. 考题：Prof. Lees book will show you ________ can be used in other contexts. [A] that you have observed [B] that how you have observed [C] how that you have observed [D] how what you have observed 二、名词从句中的主语从句 主语从句有如下几种表示方式： 1.用which, that放在句首引导主语从句。例如： That the seas are being overfished has been known for years. | 
