unit 3 seeing a doctor part b must的用法

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1、Unit3SeeingadoctorPartAmust的用法must后接动词原形;没有人称和数的变化;不能单独作谓语,与后面的动词共同作谓语;其否定形式在后面直接加not。Mustmust/mustnot1.must表示必须。Youmustdoyourhomeworkfirst.2.must表示一定(肯定性推测)。Hemustbeathome.must的用法:Whatdothesignsmean?Doyouknow?Youmustnotcycle.Youmustbecareful.Youmustturnleft.Youmustnotenter.Youmust

2、paytenyuan.Youmustkeepsilent.Youmustnotturnright.Youmustnotsmoke.must/mustnot1.mustn’t表示禁止(不准；不允许)Youmustn’tsmokehere.2.以must开头的疑问句，其否定回答要用needn’t.--MustIcleantheclassroomnow?--Yes,youmust.No,youneedn’t.mustnot的用法:Haveatry!1.MustIcarryyourbagforyou?2.MustIopenthedoor?3.MustIgetyoua

3、chair?4.MustIswitchontheTV?5.MustIborrowyournewbicycle?Answers:NO,youneedn’t.Yes,youmust.Yes,youneed.NO,youneedn’t.NO,youneedn’t.1.Howcanhegetthere?2.MustLiLeigotherebybus?A：Excuseme,canyoutellme?B：Aboutminuteswalk。A：Youmust.A：Excuseme,canyoutellme?B：Aboutminuteswalk。A：Youmust.用适当的

4、情态动词填空：1.Ican’tplaywithyou.I_______finishmyhomeworkfirst.2.I________getupearlytomorrow,becauseIhaveameeting.mustmust3.Thebook_________bereturnedbeforeSaturday.4.You________giveupsmokingatonce.It’sbadforyourhealth.5._______Ifinishtheworknow?6.Lookattheground.It’sverywet.It______have

5、rainedlastnight.mustmustMustmustImustdosomething.Mustyoustudyhard?Yes,Imust./No,Ineedn’t.