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5. 兩個或多個并列的that引導的賓語從句，只有第一個that可省

Mr. smith told the workers (that) John had worked very hard and that he wanted him stay.

4. it作形式賓語，that 引導的真正賓語從句

They want to make it clear to the public that they do an important and necessary job.

3. 同位語從句

Once Aristotle had made up his mind that heavy objects always fell faster than light objects.

that不充當任何成分，what可以在從句中充當成分：主語、賓語、表語。that在賓語從句中可以省略。下面幾種情況不可以省略：

1．主語從句　　　 2. 表語從句

7.　 賓語從句前移Whether she will win the game, I’m not sure.

4．不定式之前　　　　 5．緊跟or not　　　 6.　 同位語從句

1．主語從句句首　　　 2．表語從句　　　　 3．介詞之后

1．只要表示“命令、建議、要求”的各類名詞性從句，都要用虛擬語氣 should + 動詞原形，should 可以省略。

2．在主語從句、表語從句或同位語從句中，也要注意主從句的謂語動詞要一致，關鍵要注意動作發(fā)生的先后。

Who will win the first prize in the contest is not known to us.

Have you any idea why he was so rude?

1．在賓語從句中，當主句是一般現(xiàn)在時，其從句的謂語根據(jù)各種需要用各種時態(tài)

　　　　　 Mary is very diligent.　　　　　　　　　　 Mary was very diligent.

　　　　　 Mary is reading English.　　　　 Tom said　 Mary was reading English.

Tom says 　Mary will give us a talk.　　　　　　　　　 Mary would give us a talk.

　　　　　 Mary has been caught in the rain.　　　　 　　Mary had been caught in the rain.

　但是，賓語從句表示事實、格言、諺語等，從句的時態(tài)仍用一般現(xiàn)在時。