8AUnit5语法讲解和针对练习

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can'或mustn'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 can ' t/ mustn是的,你可以。（不，你不可以。）【知识拓展】1. may 表示可能性时,常意

2、为 “也许、可能 ”。通常只用于肯定句和否定句中。如： 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. / I'm 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

3、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

4、 father agreed to swim with me. 我父亲同意和我去游泳。We hope to visit the World 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

5、动词有 find, think , feel, make 等。如： I find it interesting to play computer games 我发现玩电脑游戏很有趣。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。女口： I don ' t knowhat to do next.Can you tell me how to get to the h

6、ospital?单项练习( ) 1.-Have you decided which senior high school to choose?-Not yet. I go to Moonlight School.A. must B. may C. need D. should( ) 2.-Is Jim coming by train?-I'm 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?-D

7、on't worry! The news be true.A. mustn't B. may not C. needn'tD. shall not( ) 4.Tom, you play with the knife. You hurt yourself.A.won't; can'tB. mustn't; mayC. shouldn't; mustD. can't ;should( ) 5. Our teachers always tell us across the street when the traffic light is

8、 red.A. to goB. don't goC. to not goD. not to go( ) 6.-May I go out for a while, Mom?-No, you . You have to finish your homework first.A. shouldn't B. needn'tC. mustn'tD. won't() 7. Mr. Li asks the students A. swimB. to swimin the river, because it's too dangerous.D. to not s

9、wimC. not to swim) 8.Wonderful! We had a big meal and enjoyed A. themselves B. myself C. yourselves a bridge over the river.B.to build C.building) 9.They decidedA. buildD. ourselvesD.built) 10.-Bob, where is Mary?-She be in the library. But I am not sure.B.may C.need off the lights when you leave th

10、e room, please.A. mustD.has to) 11.RememberA.to turnB.turningC.turnD.to turning his old friend during his stay in Tianjin.B.seeingC.sawD.to see) 13.-Amy, I hear you ' ve got many foreign coins.) 12.He promisedA.seeI have a look?-Of course, I ' ll fetch them for you.B.Must C.ShouldD.NeedA.May

11、) 14.Some people feel sick when they read a book in a car or on a boat.A.must B.should C. mayD. need) 15.-Excuse me, may I keep the book a little longer?-Sorry. You return it today.A.mustn 't B.must C.can D.can 't 二、用所给词的适当形式填空。1. -Must I finish my homework now?- No, you needn ' t. 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 h