基本基本形式MustMustHavetoHavetoMustMustHavetoHaveto基本基本意义特殊特殊用法用法表示表示推测巩固巩固练习Musthaveto肯定式mustdo…have/hastodo…否定式mustnotdo…don’t/doesn’thavetodo…needn’t/don’thaveto疑问式Must+sb.+do…?Do/does+sb.+haveto…?由must引起的疑问句，肯定回答要用must或haveto,否定回答要用needn’t或don’thaveto,意思是“不必”.—MustIfinishthetaskrightnow?—Yes,youmust./Yes,youhaveto.—No,youneedn’t./No,youdon’thaveto.Mustn’t表示禁止，意思是“不准”Must和haveto的区别：Imustlearnanotherlanguage.Ihavetolearnanotherlanguage.Tommustshaveeverymorning.Tomhastoshaveeverymorning.妈妈不在家，因此我不得不照看商店。Motherisout,soIhavetolookaftertheshop.我要留下来照看店。Imustlookaftertheshop.你留下看店。Youmustlookaftertheshop.(主观愿望：Iwantto)(客观需要：我跳槽去了法资企业。)(军人服从命令)(他长着一脸大黑胡子)必须不得不Must表示猜测，常用于肯定句中，意思为“一定是,必然”。注意must表示推断或猜测的几种情况:你姐姐一定是这家医院的医生。（表现在的猜测）Yoursistermustbeadoctorinthishospital.他此刻一定正在阅览室读报。（表正在进行的猜测）Hemustbereadingnewspapersinthereadingroomnow.昨晚一定下雨了，因为地面上是湿的。（表过去的猜测）Itmusthaverainedlastnight,forthegroundiswet.Haveto不能表推测must+bedoingmust+domust+havedone1.Mike,you______playwithfire.You______burnyourself.A.won’t;can’tB.mustn’t;mayC.don’thaveto;mustD.havegotto;shouldn’t2.You______seethedoctor,Joe.Youdon’tlookverywell.A.mustB.shallC.mayD.can3.—MustIcleanthewindownow?—No,you______.A.mustn’tB.needn’tC.can’tD.maynotConsolidationABB4.Jack’sill,sothey______changetheirplans.A.mustB.needC.havegottoD.might5.---Harryhasbeenreadingallday.—He______betired.A.shouldB.hasgottoC.hastoD.mustCD[2005广东]2.–I’vetakensomeoneelse’sgreensweaterbymistake.--It________Harry’s.Healwayswearsgreen.A.mightbeB.willbeC.mustbeD.hastobe[2004天津]1.–Whoisthegirlstandingoverthere?--Well,ifyou________know,hernameisMabel.A.mayB.canC.mustD.shallACMust表“偏要，偏偏”：AfterIgavehimadvice,hemustdotheopposite.Ifyoumustleave,tellmeandIwillletyougo.Mustyoutroublemenow?Policeman:____________.Theman:______________.…Youmusthandinyourhomeworkontime.I’msorry.Mymotherwasillyesterday,soIhadtosendhertohospital…Hemusthavedonesomethingwrong.反意疑问形式当陈述部分含有情态动词must时，我们便要分析一下must的含义。1.如果must作“一定；要；必须”讲，反意疑问句须用needn’t：Hemustworkhardatphysics,needn’the?2.而当must作推测意义“一定是；必定”讲时，反意疑问句则需根据must后的动词原形，选用相应的形式。Tommustbeathome，isn'the?Tommusthavefinishedhishomework,hasn’the?Notes：must用作名词,必须有的/做的东西Warmclothesareamustinthemountains.MustIlistentotheteacherinclass?Yup,youmust.That’samust.
