（2）用于以连系动词seem, appear, look, happen等作谓语，后接一个that从句的句中。

It seems that he is always correct. It appears that she is an experienced teacher.

5强调用法 强调it本身无词义。它用来强调句中放在表语位置的某个句子成分（谓语动词除外），其强调句型为："It+is/was+被强调成 分（通常为主语、宾语、状语）+从句（由 that/who 引导）"。

第二部分：练习

1. Can you make sure ________ the gold ring?

　　A. where Alice had put B. where had Alice put

　　C. where Alice has put D. where has Alice put

2. You can't imagine __________ when they received these nice Christmas gifts.

A. how they were excited B. how excited they were

C. how excited were they D. they were how excited

3. Word has came __________ some American guests will come for a visit.

A. what B. that C. whether D. when

4. We all agree with him on __________ he said.

A. what B. that C. why D. how

5. The reason I plan to go is __________ if I don't.

A. what she will have a disappointment B. that she will be disappointed

C. because she will be disappointed D. on account of she will be disappointed

6. ______ she will come to Beijing is not known yet.

A. Whenever B. If C. Whether D. That

7. Could you tell me ________ it snows in winter in Australia?

A. if B. whether C. that D. either A or B

8. What the doctors really doubt is ______ my mother will recover from the serious disease soon.

A. when B. how C. whether D. if

9. These pictures are so special that I would do _______ I can to save them.

A. whatever B. that C. which D. whichever

10. ______ knows the truth will tell you about it.

A. Who that B. Whoever C. Whom that D. That who

11. I will give this dictionary to ________ wants to have it.