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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容與作為中心詞的名詞所表達的內容是一樣的，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，中心詞所表達的內容不等于定語從句所表達的內容。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.)(www.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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