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1、 精品资料GRAMMAR主语从句 在复合句中充当句子主语的从句叫主语从句。【要点精讲】一、whether, who, what, which, when, where, how, why等都可引导主语从句。如：Whether we will go for an outing tomorrow remains unknown.What I need most now is more time.二、that引导主语从句时，that在句中不作句子成分，且无实际意义。当that引导的主语从句置于句首时，that不能省略；如果用it作形式主语，而把主语从句放在句末时，that可以省略。如：That I
2、will take an English test next week is certain.It is a pity (that) you made such a careless mistake.三、it作形式主语的几种常见句型It + be + n. +主语从句。常用于此句型中的名词有fact, rule, pleasure, truth, pity等。如：It is a fact that English is being accepted as an international language.It + be + adj. +主语从句。常用于此句型中的形容词有true, impor
3、tant, necessary, clear, certain等。如：Its true that the earth is round.It + v. +主语从句。常用于此句型中的动词有seem, appear, happen, follow等。如：It appeared that she was older than she really was.It + be +动词-ed形式+主语从句。常用于此句型中的动词-ed形式有known, said, proved, asked, suggested等。如：Its well known that Thomas Edison invented th
4、e electric lamp.注意：if和whether都可引导主语从句，但if不能引导位于句首的主语从句。但如果用it作形式主语，而把主语从句放在句末时，也可以用if引导。如：Whether Tom really saw Sharon was doubtful.It was doubtful if / whether Tom really saw Sharon.表语从句放在be, seem, appear等连系动词之后充当表语的句子叫表语从句。【要点精讲】一、由that, whether, as if / though引导的表语从句 The trouble is that I have l
5、ost his address. The question is whether they will go by plane or by train. It sounds as if / though someone is knocking at the door.二、由because和why引导的表语从句 This is because the weather here is cold and wet.（强调原因） Thats why Tony got angry with me. （强调结果）三、由连接代词和连接副词引导的表语从句引导表语从句的连接代词who, whom, whose, w
6、hat, which, whoever, whatever, whichever在从句中充当主语、宾语、定语或表语；连接副词when, where, why, how在从句中充当状语。如： He has become what he wanted to be ten years ago. The question is how we can find the suitable man for the job.四、需使用虚拟语气的表语从句在advice, suggestion, order, proposal等表示建议、劝告、命令等含义的名词后的表语从句中，谓语动词需用“should +动词原形
7、”，should可省略。如： My suggestion is that we (should) start early tomorrow.【即学即练】I. 用正确的连接词填空。1. _ I cant understand is _ people keep leaving the door open.2. It is true _ Tony has bought a big house, but _ he got so much money is not known.3. _ will teach us English next term has not been decided yet.4.
8、 _ the new railway station will be ready is unknown.5. My first question was _ the teacher had arrived.6. The most important thing is _ we should make a good study plan.II. 根据括号内所给的汉语提示补全下列句子。1. _ (很遗憾) our basketball team didnt win the match last night.2. _ (很明显) Mr. Green is satisfied with the res
9、ults of the examination.3. _ (对我来说好像) the only way to solve this problem is to share our ideas.4. _ (我发现很有趣) people buy expensive cars and sit in traffic jams for hours without moving.III. 用that / what / when / whether / because补全下面对话。Lucy: Why are you looking so happy?Jenny: Ive just attended a lec
10、ture. 1. _ the speaker said made me excited.Lucy: What was it about?Jenny: About health. It seems 2. _ a lot of people dont know how to keep healthy.Lucy: Quite right. How to get healthy is 3. _ Im concerned about at the moment. But what should I do?Jenny: 4. _ you will stay healthy depends on two f
11、actors exercise and diet.Lucy: You know I always do some running on the road every night.Jenny: Whether you take exercise is one thing, but 5. _ you take exercise is quite another. You shouldnt run at night because it will affect your sleep. Besides, the road isnt a good place for your running. That
12、s 6. _ theres a lot of traffic, and its too dangerous. You should run in the park instead.Lucy: I see. My plan is 7. _ I will run in the park every morning.Jenny: Great. Also, you must be careful with your diet. Its well-known that we are 8. _ we eat. So you should eat more vegetables.Lucy: Youre right. 参考答案【即学即练】I. 1. What; why 2. that; how 3. Who 4. When 5. whether 6. thatII. 1. Its a great pity that 2. Its clear that 3. It seems to me that 4. I find it amusing thatIII. 1. What2. that 3. What 4. Whether 5. when 6. because 7. that 8. what 最新精品英语资料
