（牛津译林版含答案）8A-Unit5语法讲解和针对练习.doc

1、八年级上册Unit 5 Grammar一、情态动词may（1）情态动词may没有人称和数的变化，后面直接加动词原形构成谓语。（2）may可以用来表示请求或给予许可相当于can，但may比can更正式和礼貌,常用于请求陌生人及受尊敬的人的许可。（3）否定形式为may not（无缩写），但常用cant或mustnt来表达否定意思。如：-May I smoke here? 我可以在这儿抽烟吗？-Yes, you may/ can. (No, you cant/ mustnt.) 是的，你可以。（不，你不可以。）【知识拓展】1. may表示可能性时，常意为“也许、可能”。通常只用于肯定句和否定句中。如

2、：She may go to Shanghai next week. 下周她可能要去上海。注意：may和might都可以表示可能性，might的可能性比may小，不是may的过去式。2.might委婉的表达，更正式、更礼貌。当might表示征询对方意见时，回答通常用may，不是may的过去式，如：-Might I go out to play games?-Yes, you may. -No, you may not. / Im afraid not.二、动词不定式作宾语当句子中已经有谓语动词，而我们又要表达不止一个动作概念时，其余的动作可以使用非谓语动词形式表达。动词不定式就是动词的一种非谓

3、语形式，其基本形式是“to+动词原形”。注意：动词不定式在句子中不作谓语，因此没有人称、数和时态的变化。1.常见的能带动词不定式作宾语的动词有：want，wish，hope，need，try，ask，seem，help，learn，decide，plan，start，begin，forget，remember，choose，prepare，agree等。如：The decided to go on a trip next week. 他们决定下周去旅行。My father agreed to swim with me. 我父亲同意和我去游泳。We hope to visit the World

4、 Park again. 我们希望再次参观世界公园。She choose to stay at home because she had a cold. 她选择待在家里，因为她感冒了。注意：动词不定式的否定形式是“not to + 动词原形”如：His mother asks him not to be late for school. 2.有些动词后面接复合宾语时，常用it作形式宾语，动词不定式作真正的宾语，并位于宾语补足语之后。常见的这样的动词有find，think，feel，make等。如：I find it interesting to play computer games我发现玩电

5、脑游戏很有趣。We all think it very difficult to finish the work in an hour.3. “疑问词+不定式”结构疑问词who，what，which，when，where和how后接动词不定式可在句中作宾语、主语、表语。如：I dont know what to do nextCan you tell me how to get to the hospital?单项练习( ) 1.-Have you decided which senior high school to choose?-Not yet. I _ go to Moonlight

6、School.A. must B. may C. need D. should( ) 2.-Is Jim coming by train?-Im not sure. He _ drive his car.A. must B. may C. need D. can( ) 3. -Have you heard that some bad things would happen in 2012?-Dont worry! The news _ be true.A. mustnt B. may not C. neednt D. shall not( ) 4.Tom, you _ play with th

7、e knife. You _ hurt yourself.A.wont; cantB. mustnt; may C. shouldnt; must D. cant ;should( ) 5. Our teachers always tell us _ across the street when the traffic light is red.A. to goB. dont go C. to not go D. not to go( ) 6.-May I go out for a while, Mom?-No, you _. You have to finish your homework

8、first.A. shouldntB. neednt C. mustnt D. wont( ) 7. Mr. Li asks the students _ in the river, because its too dangerous.A. swim B. to swim C. not to swim D. to not swim( ) 8.Wonderful! We had a big meal and enjoyed _.A. themselvesB. myself C. yourselves D. ourselves( ) 9.They decided _ a bridge over t

9、he river.A. buildB.to build C.building D.built( ) 10.-Bob, where is Mary?-She _ be in the library. But I am not sure.A. mustB.may C.need D.has to( ) 11.Remember _ off the lights when you leave the room, please.A.to turn B.turning C.turn D.to turning( ) 12.He promised _ his old friend during his stay

10、 in Tianjin.A.see B.seeing C.saw D.to see( ) 13.-Amy, I hear youve got many foreign coins. _ I have a look?-Of course, Ill fetch them for you.A.May B.Must C.Should D.Need( ) 14.Some people _ feel sick when they read a book in a car or on a boat.A.must B.should C. may D. need( ) 15.-Excuse me, may I

11、keep the book a little longer?-Sorry. You _ return it today.A.mustnt B.must C.can D.cant二、用所给词的适当形式填空。1. -Must I finish my homework now?-No, you neednt. You may _ (finish) it this afternoon.2. She agreed _ (let) me go early.3. The students are preparing _ (play) football after class this afternoon.4. She planned _ (visit ) our city his summer.5. -Why did you choose _ (sit) in the front of the coach?-Because I often feel sick on the coach.1-5 BBBBD 6-10 CCDBB 11-15ADACB1.finish 2.to let 3.to play 4.to visit 5.to sit