高考二轮复习 情态动词课件.ppt

1、1.常用情态动词的用法比较常用情态动词的用法比较1)在表示在表示“可能性可能性”方面方面 must,can,should,may,might 都可以都可以 用于表示用于表示“可能性可能性”。a.must 表示以事实为依据而进行的逻辑表示以事实为依据而进行的逻辑上的推理，它所指的动作或状态发生上的推理，它所指的动作或状态发生的可能性最大。的可能性最大。b.can 和和should 表示以事实、理由为依据表示以事实、理由为依据而进行猜测，它们所指的动作有发生而进行猜测，它们所指的动作有发生的可能性，但语气没有的可能性，但语气没有must 那么肯定。那么肯定。其中，其中，should 的主观性较强。

2、的主观性较强。c.may 和和might 语气较弱，表示说话人根语气较弱，表示说话人根据自己的主观判断而进行的猜测。其据自己的主观判断而进行的猜测。其中，中，might 的语气更弱一些。的语气更弱一些。2)在表示在表示“允诺允诺”方面方面 can,may,might 都可以表示都可以表示“允诺允诺”，其中其中might最为客气、委婉。最为客气、委婉。如：如：You can watch TV for as long as you like.May I use your phone please?Might I possibly borrow your umbrella please?3)在表示在

3、表示“应该应该”方面方面 must,ought to,should 都能用来表示都能用来表示“出于某种职责、义务而应该出于某种职责、义务而应该”的意思。的意思。must的语气最强烈，的语气最强烈，ought to居中，而居中，而should是表达这方面意思的普通词。是表达这方面意思的普通词。如：如：You must cut down on smoking.You ought to visit your parents more often.You should try that new restaurant.2.情态动词的特殊用法情态动词的特殊用法1)shall 用于第一人称表示坚强的信念和用

4、于第一人称表示坚强的信念和决心；用于第二、三人称，表示许诺、决心；用于第二、三人称，表示许诺、命令或规定等。命令或规定等。如如:We shall not fail.If you really want a dog,you shall have one.She shall not stay under my roof.Candidates shall remain in their seats until all the papers have been collected.2)should表示惊讶等感情表示惊讶等感情,意为意为“竟然竟然”。如：如：Its odd you should ment

5、ion Ben!I was just thinking about him.3)must 表示说话人的不满，意为表示说话人的不满，意为“偏要偏要,硬要硬要”。如：如：Eric must come and worry me with questions,just when I am busy cooking the dinner.If you must smoke,please go outside.4)may 表示祝愿表示祝愿;may as well 用来提出建用来提出建议议,意为意为“还是还是的好的好”;may well 用来表示可能性，意为用来表示可能性，意为“很可能很可能”。如：如：Ma

6、y you be happy!You may as well tell us now.Well find out sooner or later.His appearance has changed so much that you may well not recognize him.3.“情态动词情态动词+have done”结构结构1)could/might/should/ought to/need have done意为意为“本来能本来能/可能可能/应该应该/需需要做要做，但实际上未做，但实际上未做”。如：如：He could have escaped,but he chose to

7、stand and fight.It was an easy test and he should have passed,but he didnt.2)“情态动词情态动词+have done”还可用来表示还可用来表示推测过去可能发生的事情。推测过去可能发生的事情。如：如：Did you say anything that might have upset her?1.Samuel,the tallest boy in our class,_(can /should)easily reach the books on the top shelf.（北京（北京2017）2.My room is

8、a mess,but I _(neednt /mustnt)clean it before I go out tonight.I can do it in the morning.（天津（天津2017）选用括号内合适的内容填空。选用括号内合适的内容填空。neednt can3.I love the weekend,because I _(neednt,mustnt)get up early on Saturdays and Sundays.(北京北京2016)4.It was really annoying;I _(couldnt,shouldnt)get access to the data

9、 bank you had recommended.(天津天津2016)needntcouldnt5.George _(mustnt,cant)have gone too far.His coffee is still warm.(浙江浙江2016)6.I _(neednt,couldnt)have worried before I came to the new school,for my classmates here are very friendly to me.(天津天津2015)needntcant7.Cant you stay a little longer?Its gettin

10、g late.I really _(can,must)go now.My daughter is home alone.(北京北京2015)8.Life is unpredictable;even the poorest _(shall,might)become the richest.(江西江西2014)mustmightI.选用括号内合适的内容填空。选用括号内合适的内容填空。1.I expected my friend to call me after work last night,but he didnt.I suppose he _(need be/must have been)to

11、o tired.2.Please check these figures again.Theyre not accurate.You _(might/cant)have been concentrating when you added them up.must have beencant3.We _(could cook/could have cooked)in our holiday flat,but we preferred to eat out.4.You _(must be/must have been)thirsty after playing tennis all afterno

12、on.Shall I get you a drink?5.You _(neednt/shouldnt)have gone to the bus station;you can book tickets online.could have cookedmust beneednt6.Jim:What are we having for Sunday dinner?Tessa:It _(may/need)be chicken.Mum often does chicken on Sundays.7.Emma:Do you think Cindy told the boss I left work ea

13、rly yesterday?Neil:Shes away this week,so she _(mustnt/cant)have told him.maycantII.选用括号内合适的内容补全下面短文。选用括号内合适的内容补全下面短文。A When people first meet me they think I 1._(might be/can be)a teacher or a hairdresser.When Im not wearing my uniform,they never believe that Im a policewoman.When I tell people wha

14、t I do,the typical reaction is,“You 2._(dont have to be/cant be)a policewoman;might becant beyoure too small!”Im only 5 feet 4 inches tall.People always think that policewomen 3._(should be /may be)big and manly.Often people only believe me when I show them my police identity card.should be B Im Sam

15、 Roddick,daughter of Anita Roddick(the millionaire founder of Body Shop).When I introduce myself to people and say my name they often say,“Oh,you 1._(must be/ought to be)the Body Shop womans daughter.”Later they 2._(mustnt/cant)remember mymust becantname.Im very proud of my mother but I 3._(would/must)never say,“My mums Anita Roddick.”I dont know if I am very different from the typical“rich kid”because I dont know any.My friends never mention my background or money and neither do I.would