Lesson127Lesson127AfamousactressAfamousactress•表示肯定的推断：mustbe“肯定是”•表示否定的推断：can’tbe“不可能是”•(而不是mustn’tbe)eg：Hemustbeateacher.•他肯定是一名老师。•Hecan’tbeadoctor.•他不可能是一名医生。GrammarssnowheavilystayathomemusthavetoItissnowingveryhard,soIhavetostayathome.…,soIdon’thaveto/don’tneedtomeetAliceatthestation.I________takeataxi,becauseIdon’twanttogotherebybus.mustI________takeataxi,becauseIcan’tgetabus.havetoReview!haveto不得不，必须must必须hastohadtohaveto强调客观的需要，含有“不得不，被迫”的意思。而must强调主观的看法，即主观上的必要，有责任，有义务去做。haveto有人称，时态的变化，而must没有。1.Mumisn’tathome,soIhavetolookaftermysister.2.Wemusthelpeachother.Wemuststudyhard．我们一定要努力学习。Hehadtogoonfootbecausetherewassomethingwrongwithhiscar.因为他的汽车坏了，他不得不走着去。havehadtowillhavetoReview!否定式的意义不同must的否定式mustn’t意为“一定不要”、“不允许”;而haveto的否定式don’thaveto意为“不必”(=needn’t)。比较：Youmustn’ttellhimaboutit.你一定不要告诉他这件事。(这可能是秘密)Youneedn’ttellhimaboutit.你不必告诉他这件事。(他可能知道了)IthinksheisChinese.Idon'tthinkso.Shecan'tbeChinese.ShemustbeJapanese.Whatnationalityisshe?Whatnationalityishe?IthinkheisFrench.Idon'tthinkso.Hecan'tbeFrench.HemustbeGermany.Beck:贝克。Guess！Howoldarethey?Ithinksheis35yearsold.Idon'tthinkso.Shecan'tbe35.Shemustbe40yearsold.Ithinkheis65yearsold.Idon'tthinkso.Hecan'tbe65.Hemustbe70yearsold.Guess:Whataretheydoing?Ithinkheissinging.Idon'tthinkso.Hecan'tbesinging.Hemustbeplayingthepiano.Ithinktheyareeating.Idon'tthinkso.Theycan'tbeeating.Theymustbetalking.Ithinktheyaresinging.Idon'tthinkso.Theycan'tbesinging.Theymustbedancing.Whataretheirjob?Ithinkheisacook.Idon'tthinkso.He________acook.He________abaker.can'tbemustbeIthinkheisaworker.Idon'tthinkso.He________aworker.He________acook.Ithinkheis...Idon't...He________a...He________ahairdresser.Pairwork!•Guessyourpartner:•Howoldisyourfather/mother?•What'syourfather's/mother'sjob?...
