一。 主语从句。
有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下。
1）it + be + 名词 + that从句。
2）it + be + 形容词 + that从句。
3）it + be + 动词的过去分词+ that从句。
4）it + 不及物动词 + that 从句。
另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：
it is necessary (important, natural, strange, etc.) that …
it is suggested (requested, proposed, desired, etc.) that…
二。宾语从句。
1. 注意：在demand、order、suggest、decide、insist, desire, request, command, doubt等表示要求、命令、建议、决定等意义的动词后，宾语从句常用“（should）+ 动词原形”。
三。同位语从句
2. _a___caused the accident is still a complete mystery.
a. what b. that c. how d. where
答案a：观察此从句中缺少主语，而能在主语从句中即充当主语成分又引导的就只有what了
3. it worried mary a lot __a___she would pass the college entrance examination.
a. whether b. if c. that d. how
4. shanghai has taken on a new look. it isn’t like __a__ it used to be .
a .what b. how c. that d. which
5. _a__ is no possibility __bob will win the first prize in the match.
a. there, that b. it, that c. there, whether d. it, whether
6. little tommy was reluctant to tell the schoolmaster __c__ he had done the day before.
a .that b. how c .what d. where
7. the old man smiled when he saw how pretty __d__ up to be during the past few years.
a. had his daughter grown b. would his daughter grow
c. his daughter would grow d. his daughter had grown
8. h**e you seen mary lately? my boss wants to know __a___
a. how she is getting along b. how is she getting along
c. what she is getting along d. what is she getting along
9. _b__surprised me most was __such a little girl of seven could play the violin so well.
a. that; what b. what; that c. that; that d. what; what
10. these wild flowers are so special i would do __a___i can to s**e them.
a. whatever b. which c. that d. whichever
11. _c___helped to s**e the drowning girl is worth praising.
a. who b. anyone c. whoever d. the person
12. eat __c___you like and le**e the others for __comes in late.
a. any; who b. every; whoever c. whichever; whoever d. either; whoever
13. _a__ she couldn’t understand was __fewer and fewer students showed interest in her lessons.
a. what; why b. that; why c. what; because d. why; that
14. it was __a__ he said __disappointed me.
a. what; that b. that; that c. what; what d. that;what
15. it was ordered that all the soldiers __c___to the front.
a. should send b. must be sent c. should be sent d. must go
16. the true value of life is not in __b___but
a. which we get; what give we b. what we get; what we give
c. which do we get; what do we give d. how we get; that we give
17. we are all for your proposal that the discussion __a___
a. be put off b. was put off c. should put off d. is to be put off
18. go and get your coat．it's __a__ you left it．
a. where b. there c. here where d. where there
19. sarah hopes to become a friend of __c___shares her interests.
a. anyone b. whomever c. whoever d. no matter who
20. you can’t imagine __b___when they received these nice christmas presents.
a. how they were excited b. how excited they were
c. how excited were they d. they were how excited
keys:
1---5 a a a a 6---10 c d a b a 11---15 c c a a c 16---20 b a a c b
3. 1. with his work completed, the businessman stepped back to his seat, feeling pleased __he was a man of action.
(2006 湖南 )
a. which b. that c. what d. whether
2. we h**en't settled the question of __it is necessary for him to study abroad. （2006江苏 ）
a. if b. where c. whether d. that
3.__makes this shop different is that it offers more personal services.（2006辽宁 ）
a. whatb. whoc. whatever d. whoever
4. see the flags on top of the building? that was___we did this morning. （2006全国i ）
a. when b. which c. where d. what
5. please remind me___he said he was going. i may be in time to see him off. （2006全国i ）
a. where b. when c. how d. what
6. -what did your parents think about your decision?
-- they always let me do __i think i should. （2006全国iii ）
a. when b. thatc. how d. what
7. one advantage of playing the guitar isit can give you a great deal of pleasure.(2006上海 ）
a. how b. why c. that d. when
it is necessary that… 有必要……
it is important that… 重要的是……
it is obvious that… 很明显……
b. it + be + ed 分词+ that-从句
it is believed that… 人们相信……
it is known to all that… 众所周知……
it has been decided that… 已决定……
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