情态动词 (3).ppt

1、情态动词定义：情态动词用于表示期待、估计某事的发生。规则：除了ought 和 have之外，其他的情态动词 只能接动词原形变化：无人称和数的变化包括：can,could,may,might,must,have to,shall,should,will,would,need,ought to dare 第一组：can 与 could can =be able to do sth 但区别在于，be able to do 有人称、数的变化，而且意思是“通过努力做成的事”eg.(try/manage)could 在疑问句中表示委婉语气can you tell me your name?could yo

2、u tell me your name?exercise1、Jane _come to see us tomorrow,but she is not very sure.A.may B.can C.has to D.must2、They _do well in the exam.A.can be able B.be able to C.can able to D.are able to3、-May I take this book out?-No,you _ A.cant B.may not C.neednt D.arentADA 第二组：may/might 表示可能，也许，可以。偏重不太确定

3、 may 的可能性大于might搭配：may as well 最好eg.You may as well go to school.第三组：must/mustnt/can/cant must 表示有把握的推测 eg.她肯定在看书 表示必须时，VS have to mustnt 表“一定不要，禁止做”。由其引导的疑问句，肯定回答为must，否定回答为 dont have to 或者neednt cant 表不能，当表猜测时，意为“不可能”搭配：cant help doing sthexercise1、-He _be in the classroom,i think.-No,he _be in th

4、e classroom,i saw him go home a minute ago.A.can;may not B.must;may not C.may;cant D.may;mustnt2、His arm is all right,he _go and see the doctor.A.has not B.dont have to C.havent to D.doesnt have toCD 第四组：may be/maybemay be may be 中的may是情态动词，be为动词原形，通 常在句子中，表可能是。eg.He may be wrong,but im not sure.may

5、be maybe 是adv.通常在句首，表示大概也许。=perhaps eg.Maybe he is right.第五组：need/dare 均为既能做情态动词，也可以是实义动词 当做情态动词情态动词时 否定形式为neednt 疑问形式为need i.?(回答时肯定用must.否定用neednt)当做实义动词实义动词时 有人称、数的变化，后接to do不定式 he neednt see a doctor.情态动词 he doesnt need to see a doctor.实义动词 he doesnt play the guitar.实义动词exercise1、-Shall i get on

6、e more apple for you,Dad?-Thanks,but you _,i ate too many.A.may not B.must not C.cant D.dont have to2、Its not far.We _ take a taxi.A.neednt B.cant C.mustnt D.couldntDA 第六组：should/shall should 表“应该”，用于劝告、建议、责任等eg.You should turn right.=ought to 表“竟然”，用于表示惊讶，肯定句。eg.He should pass the exam.shall 表建议时，多用一、三人称eg.Shall we go for a walk?表警告和命令时，多用二、三人称eg.No one shall bring phones in the exam.