3. 主語從句不可位于句首的五種情況

　　(1) if 引導(dǎo)的主語從句不可居于復(fù)合句句首。

　　(2) It is said , (reported) …結(jié)構(gòu)中的主語從句不可提前。例如：

　　It is said that President Jingo will visit our school next week. (Right)

　　That President Jiang will visit our school next week is said. (Wrong)

　　(3) It happens…, It occurs… 結(jié)構(gòu)中的主語從句不可提前。例如：

　　It occurred to him that he failed in the examination. (Right)

　　That he failed in the examination occurred to him. (Wrong)

　　(4) It doesn’t matter how/whether …結(jié)構(gòu)中的主語從句不可提前。例如：

　　It doesn’t matter whether he is wrong or not. (Right)

　　Whether he is wrong or not doesn’t matter. (Wrong)

　　(5) 含主語從句的復(fù)合句是疑問句時，主語從句不可提前。例如：

　　Is it likely that it will rain in the evening? (Right)

　　Is that will rain in the evening likely? (Wrong)

　　4. What 與that 在引導(dǎo)主語從句時的區(qū)別

　　What 引導(dǎo)主語從句時在句時在從句中充當(dāng)句子成分，如主語.賓語.表語，而that 則不然。例如：

　　1) What you said yesterday is right.

　　2) That she is still alive is a consolation.

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