4.It is important for us to make full use of our time.

__________ __________ important __________ __________ should make full use of our time.

答案：It is;that we

3.No matter who breaks the law,he or she will be punished.

__________ __________ __________ __________ will be punished.

答案：Whoever breaks the law

2.The reason why he took swiss nationality in 1901 is still a question.

__________ he took swiss nationality in 1901 __________ __________ __________.

答案：Why;remains a question

1.The book is said to have been translated into English.

__________ is said __________ the book __________ __________ translated into English.

答案：It;that;has been

6.The scientist's theory is proved to be correct.

答案：is proved改为proves,因prove表示“被证明是”时，是不及物动词，类似系动词，后接名词或(to be)+形容词，没有被动式。

(二)用主语从句改写下列句子，每空填一词。

5.He was said to hear the news.

答案：hear改为have heard。因to hear这个动作先于was said,所以不定式的完成式(即to have done)，本句也可改为It is said that he has heard the news.

4.Does that matter whether he puts his heart into his studies?

答案：that改为it,因本句matter前需一个形式主语，真正主语是whether引导的一个主语从句，而that不能充当形式主语。

3.He found difficult to get along with other boys.

答案：difficult前加it,因find后常接复合宾语，如宾语为不定式或从句，则要借助于形式宾语it,而把真正宾语放在宾补后。

2.What they shall complete the teaching building in two months is impossible.

答案：What改为That。因that和what都可用来引导名词性从句，但that不能在从句中作任何成分，也没有词意，而what则要在从句中充当一定成分，而且也有词意。本句is前的主语从句，句意就完整。只需要引导主语从句的一个引导词，因而要用that。

(一)单句改错

1.Are you content to your present job?

答案：to改为with,因be content with=be satisfied with(对……感到满意),be content to do sth.=be willing to do sth.(愿意干某事)。