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1、八年级下册 Unit 4 A good read第4课时Grammar复习目标1通过预习，了解“疑问词十不定式”的用法。2了解must与have to的区别。复习内容“疑问词不定式”结构的用法：(1)该结构的句法功能：“wh-词不定式”主要用作宾语。We must think what to do我们必须考虑怎么办。I cant decide whom to invite.我不能决定该邀请谁。除用作宾语外，还可用作主语、表语等。When to leave has not been decided.何时离开还没有决定。The question is how to find him.问题是如何找到
2、他。(2) why用于该结构的注意点：原则上说，why后不接不定式，不过若不定式不带to，则可用why。Why not go there at once?为什么不马上去那儿呢？Why argue with her?为什么要跟她争论呢？注意这类结构通常只用于谈论现在和将来，不用于谈论过去。你昨天为什么不打扫房间？误：Why not clean the room yesterday?正：Why didnt you clean the room yesterday?(3) how用于该结构的注意点：有些动词后接“how不定式”作宾语时，how可以省略：Did you learn (how) to d
3、rive a car?你学过开车吗？但是，有些动词后面接“疑问词how不定式”作宾语时，尽管其中的how在汉语中无需译出，但不能将how省略。He knows how to play the piano.他会弹钢琴。He showed her how to swim.他教她游泳。(4)“疑问词十不定式”结构可以和复合句转换。He asked where he would go shopping after supper.He asked where to go shopping after supper. 他问他晚饭后会去哪儿购物。同义句转换:The teacher asked us how
4、we could help him.The teacher asked us_ _ _ him.must与have to的区别表示客观需要的“必须”用have to。have to和must的区别如下：(1)两词都是“必须”的意思，have to表示客观的需要，must表示说话人主观上的看法，即主观上的必要。My brother was very ill, so I had to call the doctor in the middle of the night.我弟弟病得很厉害，我只得半夜里把医生请来。（客观上需要做这件事）He said that they must work hard.
5、他说他们必须努力工作。（主观上要做这件事）(2) have to有人称、数和时态的变化，而must只有一种形式。但must可用于间接引语中表示过去的必要或义务。He had to look after his sister yesterday.昨天他不得不照顾他的妹妹。(3)在否定结构中dont have to表示“不必”，mustnt表示“禁止”。You dont have to tell him about it你不一定要把此事告诉他。You mustnt tell him about it你一定不要把这件事告诉他。( ) You_ smoke in public. A. mustnt B
6、. neednt C. wouldnt D. may not课堂练习.根据句意及所给汉语提示完成句子1He borrowed my mobile phone and hasnt _ (归还) it to me.2You should read some _ (评论) about the book before writing.3Mr Wu has _ (推荐) so many interesting books to us.4Jack _ (教) me how to use the computer yesterday.5Please _ (检查) your test paper before
7、 you hand it in.6I havent finished reading the book. So I want to _ (续借) it.II.单项填空()1.2016十堰All the students _ know cheating in the exam is not allowed.A need Bmay Cmust DCan()2.2016潍坊Must I hand in the report now?No, you _. Tomorrow is OK. Acant Bneednt Cmustnt Dshouldnt()3.2016广安Listen! I think i
8、t _ be Mr White singing in the office.No. It _ be him. He left for London just now.Amust; mustnt Bmay; mustnt Cmust; cant Dcan; can()4.2016苏州Our teacher often advises us _ the habit of making notes while reading.Ato develop Bdevelop Cto developing Ddeveloping()5.2016贵港What do you think of talk shows
9、?_. Theyre boring.AI cant stand them BI love them CIm not sure DNo problemIII.写出下列句子的同义句1Do you know how we can finish it on time?Do you know _ _ _ _ on time?2I dont know when we will have the meeting.I dont know when _ _ _ _3The question is where we should put it.The question is where _ _ it.4I ask
10、ed him how we can learn English well.I asked him _ _ _ English well.5 The young woman doesnt know what she should do.The young woman doesnt know _ _ _Unit5 Grammar复习要点1.主语beadj.enough to do sth. 这个句型用来描述主语的人品和能力，表示“某人在某方面已经能够达到做某事的程度”。如： Andy is outgoing enough to make friends easily.（1）. enough是副词，
11、修饰前面的形容词。enough用作副词时，位置在被修饰词的后面。 He is old enough to go to school. Andy is strong enough to be a player. （2）.在用本句型的时候，要注意主语和be动词的一致性。形容词前没有任何诸如very，quite等之类的修饰词。 The room is big enough to hold 20 people. 此句型可以和so that 互换。Example: He is outgoing enough to make friends easily. = He is so outgoing that
12、 he can make friends easily.2. be + too+ adj. + to -infinitive（1.） too后接形容词，to后接动词不定式。 He is too old to climb the hill. Andy is too shy to speak loudly in public. （2）.“to be+too+adj.+to infinitive”句型可与“so.that.”转换。 The boy is too short to touch the books on the shelf. =The boy is so short that he ca
13、nt touch the books on the shelf.复习检测一.单项选择（ ）1. The young boy is _ to go back to school. A. enough well B. good enough C. well enough D. enough good( ) 2. He is patient enough _ for me that night. A. waiting B. wait C. to wait D. waits( ) 3. The elephant is too big _ through the door. A. to go B. goes C. cant go D. not to go( ) 4. He drives too _ to stop in a short time. A. fast B. faster C. fastly D. fastest( ) 5. The maths problem is _ hard _ I cant work it out. A. too, to B. enough,/ C. so, that D. enough, to 二.用所给词的适当形式填空1His brother is not old enough _ (go) to school.2He did
