情态动词must-have+to.ppt

1、 Must have to肯定式肯定式 must do have/has to do否定式否定式 must not do dont/doesnthave to do neednt/dont have to 疑问式疑问式 Must+sb.+do?Do/does+sb.+have to?由由must引起的疑问句，引起的疑问句，肯定回答肯定回答要用要用must或或have to,否定回答否定回答要用要用neednt或或dont have to,意思是意思是“不必不必”.Must I finish the task right now?Yes,you must./Yes,you have to.No,

2、you neednt./No,you dont have to.Mustnt 表示禁止，意思是表示禁止，意思是“不准不准”Must 和和have to 的区别：的区别：I must learn another language.I have to learn another language.Tom must shave every morning.Tom has to shave every morning.妈妈不在家，因此我不得不照看商店。妈妈不在家，因此我不得不照看商店。Mother is out,so I have to look after the shop.我要留下来照看店。我要留

3、下来照看店。I must look after the shop.你留下看店。你留下看店。You must look after the shop.(主观愿望：主观愿望：I want to)(客观需要：我跳槽去了客观需要：我跳槽去了 法资企业。法资企业。)(军人服从命令军人服从命令)(他长着一脸大黑胡子他长着一脸大黑胡子)必须必须不得不不得不Must 表示猜测，表示猜测，常用于肯定句中常用于肯定句中，意思为，意思为“一定是一定是,必然必然”。注意注意must表示推断或猜测的几种情况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。你姐姐一定是这家医院的医生。（表现在表现在的猜测）的猜测）Y

4、our sister must be a doctor in this hospital.他此刻一定正在阅览室读报。他此刻一定正在阅览室读报。（表正在进行表正在进行的猜测）的猜测）He must be reading newspapers in the reading room now.昨晚一定下雨了，因为地面上是湿的。（昨晚一定下雨了，因为地面上是湿的。（表过去表过去的猜测）的猜测）It must have rained last night,for the ground is wet.Have to 不能表推测不能表推测must+be doingmust+domust+have done1

5、.Mike,you _ play with fire.You_ burn yourself.A.wont;cant B.mustnt;mayC.dont have to;must D.have got to;shouldnt2.You _ see the doctor,Joe.You dont look very well.A.must B.shall C.may D.can3.Must I clean the window now?No,you _.A.mustnt B.neednt C.cant D.may notConsolidationABB4.Jacks ill,so they _

6、change their plans.A.must B.need C.have got to D.might5.-Harry has been reading all day.He _ be tired.A.should B.has got to C.has to D.mustCD2005 广东广东2.Ive taken someone elses green sweater by mistake.-It _ Harrys.He always wears green.A.might be B.will be C.must be D.has to be2004 天津天津1.Who is the

7、girl standing over there?-Well,if you _ know,her name is Mabel.A.may B.can C.must D.shallACMust 表表“偏要，偏偏偏要，偏偏”：After I gave him advice,he must do the opposite.If you must leave,tell me and I will let you go.Must you trouble me now?Policeman:_.The man:_.You must hand in your homework on time.Im sorry

8、.My mother was ill yesterday,so I had to send her to hospitalHe must have done something wrong.反意疑问形式反意疑问形式当陈述部分含有情态动词当陈述部分含有情态动词must时，我们便要分析一下时，我们便要分析一下must的含义。的含义。1.如果如果must 作作“一定；要；必须一定；要；必须”讲，反意疑问句须用讲，反意疑问句须用neednt：He must work hard at physics,neednt he?2.而当而当must作推测意义作推测意义“一定是；必定一定是；必定”讲时，反意疑讲时，反意疑问问句则需根据句则需根据must后的动词原形，选用相应的形式。后的动词原形，选用相应的形式。Tom must be at home，isnt he?Tom must have finished his homework,hasnt he?Notes：must 用作名词用作名词,必须有的必须有的/做的东西做的东西Warm clothes are a must in the mountains.Must I listen to the teacher in class?Yup,you must.Thats a must.