1、Unit 1 Animals on the FarmUnit 1 Animals on the Farm Lesson 4 Horses and Rabbits Lesson 4 Horses and Rabbits情态动词情态动词can,may,mustcan,may,must的用法的用法 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 not may/may not must/
2、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(
3、可能可能)-通常用于肯定形式通常用于肯定形式 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:may/may not以以may开头的疑问句,其否定回开头的疑问句,其否定回答用答用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
4、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must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.Can you?你会你会/能能吗?吗?Yes,I can./No,I cant.是的,我会是的,我会/能。能。/不,不,我不会我不会/不能。不能。What can you do?你会你会/能干什么?能干什么?I can 我会我会/能能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 ping-pong?Yes,I can.Thank you!