must-、have-to-区别及专项练习

must与haveto的区别情态动词must和haveto都有“必须”的含义，它们的用法如下：（一）、must“必须”、“应该”的用法:1.must表示“必须”、“应该”。例如：①Wemustprotectourenvironment.(我们必须保护环境。）②Everyonemustobeytherule.（人人必须遵守制度。）2.must的否定形式mustnot表示“不应该”、“禁止”、“不准”。语气比较强烈。例如：①Youmustn’tspeaklikethat.(你不应该像那样讲话。）②Youmustn’tbelateforschool.（你不应该上学迟到。）3.在回答must的问句时，肯定形式用must来回答，但否定形式用needn’t或don’thaveto来回答。而不用mustn’t来回答。例如：①——MustIbehomebefore8o’clock?(8点之前我必须回家吗？)——Yes,youmust.No,youneedn’t./No,youdon’thaveto.（是，你必须。）（不，你不必。）（二）、haveto表示“必须”、“不得不”，例如：①Hehastostayinbedfor3or4days.(他必须卧床休息三四天。）②Wewillhavetogetupearlytomorrow.（明天我们必须早起。）补充：havegotto是haveto的口语形式。例如：①I’vegottoleaveforNanjing.(我不得不去南京。)*Must与haveto的区别：must表示的是说话人的主观看法，而haveto则表示的是客观需要。Must一般只有现在时，而haveto有更多的形式。①Imustgonow.(主观看法)②Mymotherisill,soIhavetogonow.(客观需要)*Haveto与havegotto的区别：havegotto虽然是haveto的口语形式，但二者在用法上有严格的区别：haveto的前面还可以用情态动词或助动词，而havegotto却不可以；haveto的否定形式为don’t/doesn’t/didn’t+haveto,疑问式为Do/Does/Did+主语+haveto…?而havegotto的否定形式是在have后加not,疑问式把have提前。例如：①Wedon’thavetogohome.①Doyouhavetogohome?②Wehaven’tgottogohome.②Haveyougottogohome?专项练习11.----MustIdoitnow?-----No,you_______.A.needn’tB.don’thavetoC.mustn’tD.AorB2.It’snearlyseveno’clock.Jack______behereatanytime.A.mustB.needCshouldDcan.3.------WhencanIcomeforthesephotos?Ineedthemtomorrowafternoon.-------They____bereadyby12:00.A.canB.shouldC.mightD.need4.They___dowellintheexam.A.canbeabletoB.beabletoC.canabletoD.areableto5,-CouldItakethisbookout?-No,you___.A.can'tB.couldn’tC.needn'tD.aren't6.You___goandseeadoctoratoncebecauseyou'regotafever.A.canB.mustC.dareD.would7.-CanyouspeakJapanese?-No,I____.A.mustn'tB.can'tC.needn'tD.maynot8.Eventhetopstudentsinourclasscan'tworkoutthisproblem,soit___beverydifficult.A.mayB.mustC.canD.need9.Heisn'tatschool.Ithinkhe___beill.A.canB.shallC.mustD.hasto10.Thechildren___playfootballontheroad.A.can'tB.canC.mustn'tD.must11.Hisarmisallright.He___goandseethedoctor.A.hasnottoB.don'thavetoC.haven'ttoD.doesn'thaveto12.Excuseme.___youpleasepassmethatcup?A.DoB.ShouldC.WouldD.Must13.-Wouldyouliketogoboatingwithus?-Yes,___.A.I'dlikeB.IwantC.I'dliketoD.Ido