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1、Learninggoals:复习部分情态动词的用法12情态动词的新用法—情态动词表示推测3对物品的归属进行猜测思考?你记得学过哪些主要的情态动词吗?12情态动词有哪些语法特征呢?can.could,may,must,might,haveto…3情态动词如何使用呢?1.情态动词有具体的词义。2.情态动词没有人称和数的变化。3.情态动词后必须跟动词原形,两者一起构成谓语动词。4.一般疑问句提前边,否定句在后直接加not.can/cannot1.表示能力(会)1)MarycanspeakEnglish,butshecannotspeakFre
2、nch.2)Canyouliftthisheavybox?3)Canyouskate?2.表示允许(可以)1)CanIuseyourdictionary?2)-----CanIgohomenow?-----Yes,youcan./No,youcan’t.1.是can的过去式; 表示过去的能力;Hecouldrideabikeattheageoffive.2.用于婉转语气,多用于问句。“能,可以”Couldyoupleasecleantheroom?----CouldIcometoseeyoutomorrow?----Yes,youca
3、n.(No,youcan’t.)此处could不是过去式,只是语气更委婉,答语中不能用could和couldn’t,要用can和can’t。couldmay/maynot1.表示请求和允许(可以),比can 正式.MayIcomein?He may come if he likes.may的用法:may/maynotmay的一般疑问句,其否定回答用can’t或mustn’t。1.--MayIgohomenow?--Yes,youmay./Sure./Yes,please.No,youcan’t./mustn’t.2.--MayIusey
4、ourwashroomnow?--No,you______.There’ssomethingwrongwiththetoilet.A.needn’tB.mustn’tC.shouldn’tD.didn’tBmust/mustnotmust必须,表示说话人的主观意志。Youmustdoyourhomeworkfirst.must的用法:must/mustnotmustn’t表示禁止,不准,不允许。Youmustn’tsmokehere.You mustn’t play with fire.mustnot的用法:must/mustnot以m
5、ust开头的疑问句,肯定回答:Yes,…must.否定回答:No,…needn’t.或No,…don’thaveto.--MustIcleantheclassroomnow?--Yes,you_______.--No,you_________./No,you____________.mustneedn’tdon’thavetoneed作情态动词,主要用于疑问句和否定句中need一般疑问句:肯定回答用Yes,…must,否定回答用No,…needn’t.或No,…don’thaveto.如:NeedIdoitnow?Yes,you____
6、____。No,you___________________.need作行为动词,有人称、数和时态的变化后接todo,即needtodosth.needmustneedn’t/don’thavetomight/maymight1.是may的过去式。2.表示推测,可能性较小。1)Hemightbe very busy now.2)Your mothermightknow the truth.may也表示猜测,意为“可能”。3)WhereismyEnglishbook?Itmight/maybeinyourdesk.Ⅰ.用适当的情态动词填空
7、:1.Icanplayfootball.__________youswim?2.Ican’tplaywithyou.I__________finishmyhomeworkfirst.3.I__________getupearlytomorrow.becauseIhaveameeting.4.Nobody___________livewithoutair.Canmustmustcan5.__________Icomein?Yes,please.6.__________youpleasetellmewherethestationis?7.M
8、ustIfinishtheworknow?No,you___________.8.--NeedItakethisbookout?--Yes,you_____.A.canB.mayC.needD.must9.