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3. 在通常情況下，引導賓語從句的that是可以省略的，但也并不是說它在任何情況下都可以省略。如以下各例中的that就不宜省略：

Everybody could see what happened and that Tom was frightened. (and 連接兩個名詞性從句，that從句放在and后面時，that不能省略)

I know nothing about him except that he is a student.(that 引導的賓語從句做介詞賓語時，that不能省略)

We all thought it a pity that the conference should have been called off.（如果賓語從句有補足語，用it作形式賓語時，that不省略）

He judged that, because he was a child, he did not understand wine. (當that從句和主句謂語動詞之間或從句主語之間有插入語時，that不可省略)

四、that引導同位語從句和引導定語從句時的區(qū)別

一、從句法功能上來看：同位語從句中連接詞that在從句中不作句子成分，也沒有詞匯含義，只起連接作用，其作用大致相當于一個冒號；而引導定語從句的that是關(guān)系代詞，且在句中充當句子的成分(主語或賓語)。如：

I hold the belief that where there is a will, there is a way. (that引導的是同位語從句，它在從句中不充當句子成分)

The letter that I received yesterday was from my sister. (that引導的是定語從句，它在從句中充當賓語)

二、從意義上來看：同位語從句所表達的內(nèi)容與作為中心詞的名詞所表達的內(nèi)容是一樣的，兩者之間可以劃等號；而定語從句則是限制或修飾中心詞的，中心詞所表達的內(nèi)容不等于定語從句所表達的內(nèi)容。如：

He told me the news that his uncle would come home from abroad on National Day. (that引導的是同位語從句，其中the news = his uncle would come home from abroad on National Day)

This is the factory that we visited last month. (that引導的是定語從句，其中 the factory≠ we visited last month.)(m.52ysedu.com)

三、從中心名詞上來看：同位語從句中的中心名詞常是一些表示概括意義的抽象名詞，這類名詞有fact, idea, view, thought, order, suggestion, news, truth, hope, promise, answer, belief, condition, doubt, fear, problem, proof, question 等。而定語從句中的中心名詞是沒有限定的。如：

四、引導同位語從句的連詞that一般不能省略，而在定語從句中，that作賓語時，可以省略。另外，引導定語從句的that若指事物，它可以用which來代替，而在同位語從句中，that 永遠不能用which替代。

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