情态动词must-have-to

基本形式MustHaveto基本意义特殊用法表示推测巩固练习1.Must/haveto区别Imustlearnanotherlanguage.Ihavetolearnanotherlanguage.Imustgonow,orIwillbelate.It’stoolate.Ihavetotakeataxi.妈妈不在家，因此我不得不照看商店。我要留下来照看店。你留下看店。(主观愿望)(客观必要性)(主观意愿)(客观必要性)Musthaveto肯定式mustdo…have/has/hadtodo…(人称和数变化)否定式mustnotdo…don’t/doesn’t/didn’thavetodo…疑问式Must+sb.+do…?Do/does/did+sb.+haveto…?由must引起的疑问句，肯定回答要用must.否定回答要用needn’t或don’thaveto,意思是“不必”.—MustIfinishthetaskrightnow?—Yes,youmust.—No,youneedn’t./No,youdon’thaveto.Mustn’t表示禁止，意思是“不准”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.maynotConsolidationABBConsolidation4.Jack’sill,sothey______changetheirplans.A.mustB.needC.havegottoD.might5.---Harryhasbeenreadingallday.—He______betired.A.shouldB.hasgottoC.hastoD.mustCD