英语必修3 Unit 4 主语从句
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练习坊I. 根据下列各句句意及所给单词的 首字母或汉语提示,写出该单词的 正确形式。 1. Her school report shows that she biology is weak in English and _______ (生 物). 2. He wanted to be a physicist (物 _______ 理学家) and devote himself to scientific research.
3. Anything that is dropped on the earth falls towards the ground because of the force of g______. gravity 4. The country has the world’s best c______ for wild climate grapes.
II. 用括号中所给单词的适当形式填空。 1. She sang to the music with her hand gently waving _______ (gentle). 2. To his surprise, the car suddenly went crashed out of control and _______ (crash). 3. Suddenly, most sunlight was blocked out (block out), so the sky at __________ noon looked as if it were at dusk.
名词性从句Who will win the match is still unknown.主语从句
I want to know what he has told you.宾语从句
The fact is that we have lost the game.表语从句
The news that we won the game is exciting.同位语从句
【寻规找矩】请观察下列句子, 注意主 语从句的用法。 1. That the earth travels round the sun is a well-known fact. 2. It is uncertain whether the artist can do it or not. 3. Who will act the lead in the play has not been decided yet.
4. Where the young man has gone is not known. 5. It is not yet decided when and where the test will be given.
主语从句:
做主语用的名词性从句,因其在复合句 中做主语,又称主语从句,引导主语从句的有连词that ,whether, 连接代词who ,what , which, 连接副词when,where, how, why 等。
1)从属连词:that, whether等. that 引导主语从句只起引导作用,本身无实 际意义,在主语从句中不充当任何成分,但 不能省略。That people cut down too many trees destroyed the balance of nature. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
If × Whether the solid shape would last or not was not clear. . if It was not clear whether the solid shape would last or not.Real Subject Formed Subject Subject Clause
引导主语从句在句首只能用whether, Conclusion:
有it作形式主语的whether/if都可以.
注意: 由that 引导的主语从句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。 例如:1. That he will refuse this piece of advice is impossible. It is impossible that he will refuse this piece _______________________________________ of advice. _______________________________________
*it为形式主语2.That they should like each other is natural. It is natural that they should like each other. _____________________________________
这样就构成了下面一些常用句型:
1) It is + n. +从句
It is a pity/shame that... 遗憾的是…… It is a surprise that…令人惊奇的是… It is a fact that… …
是事实 It is common knowledge that… …是常识It is a pity that *_______________(很遗憾)we lost the match. It is a fact that *______________(这是事实)he cheated in the exam.
2) It is + adj. +从句 It’s certain that… 肯定… It is possible that... 很可能…… It is unlikely that... 不可能…… It is obvious that… 很明显… It is necessary \important \natural\... that… +(should) +do…
*_________________(很可能)she will come It is possible that back tomorrow. It is obvious that *_________________(很明显)this measure is effective.
3) It +不及物动词+从句 It happened that... 碰巧…… It occurred to me that…我突然想起…It happened that *________________(刚好)I came into the office at that time.*____________________(我突然想起)I forget to It occurred to me that sent the letter.
4) It + be +过去分词+从句It is said that... 据说…… It is known to all that... 众所周知…… It is reported that... 据报道…… It is believed that...据信……;人们相信…… It is suggested that + (should)do... 建议…… It must be admitted that…必须承认…… It cannot be denied that… 不可否认…… It must be pointed out that…需指出的是……
It is reported that *___________________(据报道)20 people were killed in the accident. It is suggested that *______________________(建议)we should eat more vegetable and do more exercise.
2.连接代词who ,what ,which, whatever, whichever, whoever What many scientists believe is that the continued presence of water … Who will take part in the meeting has not been decided. Whoever breaks the law will be punished. Which student will win the first is uncertain.
3)连接副词when,where,
why等。
how,
Why they suddenly disappeared still remains a mystery.When they will set off is not decided.
Where she is from is unknown.How we will paint the house has not been decided.
Complete the sentences using what, whether, where, when, who, why, how or that.What 1.(_____ is needed for success) is your hard work. When/How 2.(______ they will arrive )has been told to the teacher. Where/whether 3.(_____ we will go tomorrow )hasn’t been decided yet.
Who 4.(______ can join in the sport meet) is decided by the teacher 5.(________ it will rain or not) is not clear. Whether Why 6. (____ the earth is becoming warm) is a good topic for research.
7.(______ the earth is a solid ball) is known to us all. ThatConclusion: 主语从句作主语时,谓语动词一般用单数形式。
Summary: Subject Clause1.用 that/whether/if/where/ how/when/why/who /what/which/ how much / etc. 来连接主语从句. 2.That 在主语从句中不能省略. 3.引导主语从句在句首只能用whether, 有it作形式主语的whether/if都可以.4.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.4 种句型。 5.主语从句作主语时,谓语动词
一般用单数形 式。
1. _____ we need more practice is quite obvious. A. What B. That C. When D. /
2. _______ they can solve the question is still unknown. A. If B. Which C. Whether D. What
3. _____ he said at the meeting astonished everybody. A. Why B. What C. That D. Who 4. ____ is a fact that English is accepted as an vinternational language. A. There B. This C. That D. It
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