初中英语重点语法——主语从句
一、主语从句的概念与类型
主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等.
例如:
That she was chosen made us very happy.
她当选了使我们很高兴.
What caused the accident is a complete mystery.
是什么导致了这次事故还完全是一个谜.
Whether she will come or not is still a question.
她是否来还是一个问题.
Which team will win the match is still unknown.
哪个队会赢得这场比赛还不知道.
Whoever comes to the party will receive a present.
参加聚会的每一个人都将收到一份礼物.
When they will start has not been decided yet.
他们何时出发还没决定.
注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免'头重脚轻',常用it作形式主语,而把从句放在后面.
演员杜敏赫例如:
It is a pity that she has made such a mistake.
她犯了这样一个错误,真是遗憾.
It depends on the climate whether they are going shopping today.
他们是否今天去购物还得看天气情况.
这样就构成了下面一些常用句型:
lol英文名字大全1)It is + adj. / n. +从句
It is a pity/遗憾的是……
It is 很可能……
It is 不可能……
2)It +不及物动词+从句
It seems/似乎……
It 碰巧……
3)It + be +过去分词+从句
It is 据说……
It is known to 众所周知……
郑海霞简历It is 据报道……
It is 据信……;人们相信……
It is 有人建议……
It must be pointed 必须指出……
It has been 已证明…….例如:
It is believed that at least a score of buildings were damaged or destroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉.
It is suggested that the meeting should be put off.有人建议会议延期召开.
It's reported that three people were killed in the accident and five were hurt badly.据报道,事故中三人丧生,五人重伤.
It is known to all that Taiwan is an inseparable part of China.众所周知,台湾是中国不可分割的一部分.
[巩固练习]
1. Does _______ matter if he can't finish the job on time?
A. this B. that C. he D. it
张晚意有多高
2. It worried her a bit _______ her hair was turning grey.
A. which B. that C. if D. for
3. _______ is a fact that English is being accepted as an international language.
A. There B. This C. That D. It
二、学习主语从句应该注意的几个问题
1)引导词that与what
what既有引导主语从句的作用,同时又在从句中作句子成分(主语、宾语、表语等).这时what相当于all that/,常译成'所……的(东西、事情、话等.)';而that只起连接作用,本身无实际意义,在从句中也不担当任何句子成分.但that引导的主语从句放在句首时,不能省略that.
例如:
What is done can't be undone. 
(谚语)已成定局,无可挽回.
What we can't get seems better than what we have.
我们得不到的东西似乎比已得到的要好.
That we should work out a plan to deal with the present serious situation is important.
我们应该制定一项计划来应付目前严峻的形势,这一点非常重要.
That a new teacher will come to teach us geography is true.
一位新老师将来教我们地理,这是真的.
[巩固练习]
4. _______ what they told me really true?
A. Has B. Is C. Does D. Have
5. It matters little _______ a man dies, but _______ matters much is _______ he lives.
什么专业热门
A. how; what; how B. how; it; how C. why; it; why D. that; what; that
6. _______ she couldn't understand was _______ fewer and fewer students showed interest in her lessons.
A. What; why B. That; what C. What; because D. Why; that
7. It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.
A. that B. when C. what D. how
8. _______ fashion differs from country to country may reflect the cultural differences from one aspect.
A. What B. That C. This D. Which
9. -What made her parents so angry?
- _______ she had failed in the examination.
A. As B. Because C. Since D. That
2)引导词if和whether
if和whether引导动词后的宾语从句时一般可通用,但介词后的宾语从句、主语从句(放在句首时)、表语从句常由whether引导.
例如:
Whether she will go home or not is unknown.
她是否回家还不得而知.
Whether we shall raise ducks or geese remains to be decided.
我们是养鸭还是养鹅仍没决定.
=It remains to be decided whether/if we shall raise ducks or geese.
[巩固练习]
10. _______ we'll go camping tomorrow depends on the weather.
A. If B. Whether C. That D. Where
3)其它引导词
连接代词who, which, whom, whose有各自的意义,起连接作用,并在从句中充当语、宾语、表语、定语等;连接副词when,where, why, how等有各自的意义,起连接作用,并在从句中充当状语.
[巩固练习]
11. -Do you remember _______ he came?
-Yes, I do. He came by car.
A. how B. when C. that D. if
12. It was a matter of _______ would take the position.
A. who B. whose C. whom D. whomever
13. -I drove to Zhuhai for the air show last week.
-Is that _______ you had a few days off?
A. why B. when C. what D. where
14. I read about it in some book or other, does it matter _______ it was?
A. where B. what C. how D. which
三、语气
在It is necessary / natural / important / + that-clause这类句型里,that所引导的主语从句中谓语动词用'should +原形',表虚似语气.
例如:
步步惊心韩国收视率It is necessary that the problem should be settled at once.