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1、Unit 8Music Lesson 1Enjoy the Story情态动词情态动词情态动词后接动词原形情态动词后接动词原形;没有人称和数的变化没有人称和数的变化;不能单独作谓语不能单独作谓语,与后面的动词共同作谓语与后面的动词共同作谓语;其否定形式在后面直接加其否定形式在后面直接加not。Modal verbs情态动词情态动词can/can notmay/may notmust/must notModal verbs情态动词情态动词can/can not1.表示能力表示能力(会会)Mary can speak English,but she can not speak French.2.表
2、示允许表示允许(可以可以)Can I use your dictionary?I cant find mine.3.表示推测表示推测(可能可能)-通常用于否定形式通常用于否定形式 He cant be in the office.I saw him go out just now.may/may not1.表示允许表示允许(可以可以)May I come in?2.表示推测表示推测(可能可能)-通常用于肯定形通常用于肯定形式式 She may be still waiting for us.3.表示祝愿表示祝愿 May you have a happy weekend.may的用法的用法:ma
3、y/may not以以may开头的疑问句，其否定回答开头的疑问句，其否定回答用用cant或或 mustnt。-May I go home now?-Yes,you may.No,you cant.may not的用法的用法:must/must not1.must表示必须表示必须 You must do your homework first.2.must表示表示 一定一定(肯定性推测肯定性推测)He must be at home.must的用法的用法:must/must not1.mustnt表示禁止表示禁止(不准；不允许不准；不允许)You mustnt smoke here.2.以以mu
4、st开头的疑问句，其否定回答开头的疑问句，其否定回答要用要用neednt.-Must I clean the classroom now?-Yes,you must.No,you neednt.must not的用法的用法:What do the signs mean?Do you know?You must not cycle.You must be careful.You must turn left.You must not enter.You must pay ten yuan.You must keep silent.You must not turn right.You must not smoke.Can you?你会/能吗？Yes,I can./No,I cant.是的，我会/能。/不，我不会/不能。What can you do?你会/能干什么？I can 我会/能Can you swim?No,I cant.Yes,I can.Can you play football?Yes,I can.Its easy!What can you do?I can run fast!Can you play the piano?Yes,I can.