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1、定义祈使句第二课时单元语法专练语.导图祈使句一般用来表示请求、命令、劝告、号召、警告、禁止等在祈使句中.通常省略主语youDo型:动词原形+宾语+其他肯定句式句式结构否认句式B磔:Be+表语+其他Let型:Let+宾语+动词原形+其他Dont/Never+动词原形+宾语+其他No+名词/动名词+其他Dontlet+宾语+动词原形+其他/Let+宾语+not+动词原形+其他相同点have to与 mustM用法不同点注意have t口 must都可以表示“必须”, must通常表示说话人的主观看鼻，语气比拟强烈:have to往往强调客观需要二者否认式含义不同：mustnt表示“不准:禁止don
2、t have to表示“不必”must一般只表示现在,无人称和数的变化;have to可用于不同时态，有人称和数的变化以must开头的一般疑问句.其肯定回答用must否认回答要用needn峨dont have to,不能用mustnt语法精练限时:12分钟I .根据句意用所给词的适当形式填空LIts an important meeting. Dont be (not be) late.2 .Please come (come) here on time.3 .Let9s play (play) soccer now.4 .Please be (be) quiet in the library
3、.5 .No taking (take) photos here.II .根据句意用must或have to填空Jim,you must wear your clothes by yourself every morning.1 .一Must I read the book in the reading room?一No,you donthave to .2 .There is no bus nowJ have to go back home on foot.3 .一Must I finish my homework today?一Yes,youmust ,.一Mom,can I get up
4、 late on the weekend?Sure.You dont have to get up early.in.单项填空( A)1 .2020黑龙江绥化改编一Must I return(归还)the book to you now?一No,you.You can do it tomorrow.A.neednt B. mustntC.must D.need( A)2.2020四川乐山改编we leave the library before 5 oclock?一No,you neednt.You can stay here until 5:30.A.Must B.MayC.Can D.Do
5、( B )3.slowly,Michael!There are lots of people on the street.A.To drive B.DriveC.DrivesD.Driving( D)4.一Peter,do you want to go shopping with me?Yes,but I finish my homework first.A.neednt B. mustntC.can D.must( C)5.一Jennyjets Tom for the tape player.OK.A.to askB.asksC.ask D.askingW.按要求完成句子，每空一词.You
6、can飞 watch TV on school nights.(改为否认祈使句)Dont watch TV on school nights.1 .He has to go to bed at ten oclock.(改为一般疑问句)Does he have to go to bed at ten oYlock?2 .Let him play computer games.(改为否认句)Dont let him play computer games.3 .Dont fight in the classroom.(改为同义句)Never/No fight/fighting in the classroom.