七年级英语下册Unit4Donteatinclass第三课时SectionAGrammarFocus

第三课时SectionA(GrammarFocus～3c)祈使句1．祈使句概念用于表达命令、请求、劝告、警告、禁止等的句子叫作祈使句。祈使句最常用于表达命令，因其对象(即主语)是第二人称，所以通常都省略。以let开头的句子也是祈使句的一种，常用于第一、三人称，表示建议、邀请、劝说等。祈使句的动词都用一般现在时，句末用句号表示结束。►Goandwashyourhands.去洗洗你的手。(命令)►Bequiet，please.请安静。(请求)►Letmetry.让我试试。(建议)2．祈使句的基本结构类型句型结构示例Do型肯定：动词原形(＋宾语)＋其他成分Standup.起立。否定：Don't＋动词原形(＋宾语)＋其他成分Don'tplaywithwater.不要玩水。Be型,肯定：Be＋表语(名词或形容词)＋其他成分,Becalm.冷静。类型句型结构示例Be型否定：Don't＋be＋表语(名词或形容词)＋其他成分Don'tbestupid.别犯傻。Let型肯定：Let＋宾语＋动词原形＋其他成分Let'sgoswimming.咱们去游泳吧。否定：①Don'tlet＋宾语＋动词原形＋其他成分②Let＋宾语＋not＋动词原形＋其他成分Don'tlethimgo.别让他走。Lethimnotgo.别让他走。haveto的句型结构肯定句：Wehavetobequietinthelibrary.在图书馆，我们必须安静。否定句：Wedon'thavetoweartheuniformtoday.今天，我们没必要穿校服。特殊疑问句：Whatdoyouhavetodo?你必须做什么？一般疑问句：Dowehavetoeatinthedininghall?我们必须在餐厅吃饭吗？一、用括号内所给单词的适当形式填空。1．Youcan't______(wear)ahatinclass.2．___________(notrun)inthehallways.3．Mysister_____(have)togetupearlyinthemorning.4．____(do)yourhomeworkfirst.5．Let's_____(play)soccerafterschool.wearDon'trunhasDoplay二、单项选择。6．—It'slate，Teresa.____earliernexttimeandyou'llhaveenoughtimetohavebreakfast.—OK，Mom.I'llremember.A．GetupB．GettingupC．TogetupD．Getsup7．____thisrockmusic，please.I'mafraidsomepeoplecan'tstandthenoise!A．StoppingB．StopC．StopsD．StoppedAB8．____callmeWangWang！It'smydog'sname.A．NotB．NoC．Don'tD．Doesn't9．Tom，____afraidofspeakinginfrontofpeople.Youarethebestone.A．don'tB．notC．notbeD．don'tbe10．—Jim，____readbookswhileyouarewalkinginthestreet.It'sverydangerous.—OK，thankyou.A．don'tB．doesn'tC．won'tD．can'tCDA三、将下列祈使句改为否定式。11．Comehereearly.Don'tcomehereearly.12．Askhim.Don'taskhim.13．Pleasewaitforher.Pleasedon'twaitforher.14．Readthebookcarefully.Don'treadthebookcarefully.15．Let'sgotheretogether.Let'snotgotheretogether.