1、欢乐语法2 情态动词Greeting:Can you?Warmup:Sing a song May I help you?1)can的主要用法是：A.表示体力或脑力的能力：eg.The girl can dance very well.B.表示说话的推测事物的可能性等：eg.Can the news be true?C.在口语中,can可以表示请求或允许:eg.Can I sit here?can may：may 常用来表示：A.表示请求、允许;比can较为正式:eg.May I come in?You may go now.B.表示说话人的猜测:“也许”“可能”:通常只用于肯定句和否定句中。
2、eg.-I believe the man is from England.-But I may be wrong.The guest may arrive this afternoon.在肯定句中，may 的可能性比can 高，may 表示现实的可能性，can 表示理论上的可能性。如：The road may be blocked.这条路可能不通了。The road can be blocked.这条路可能会是不通的。在疑问句中，表示可能性用can。如：Where can he be?他会在哪呢？C.表示祝愿;但语气较正式:eg.May you succeed!May you have a
3、good journey!must must 的主要用法：的主要用法：1.表示必然性。eg:We must all die.人总要死的。2.表示强制或者义务。eg:You must get up early.你必须早起来。注意:must not 的意思是不许可，不应该或者禁止。如：We mustnt waste our time.-May I take this magazine out?-No,you mustnt.must 用于一般疑问句的时候，肯定回答应该用yes,please 或者 Im afraid so,其否定回答应该用 neednt 或者dont have to。如：表示推测，语
4、气非常肯定，近乎确定的意味，一般用在肯定句。如：It must be eleven oclock now.He must be crazy.在表示推测的否定或者疑问句中必须用 can,不可以用 must。If Mary didnt leave here until five oclock,she cant be home yet.如果玛丽五点才离开这儿，他此时一定还未到家。3.A:_ I go with my friend to the harvest festival?B:Yes,you _ _.Maymay go(with your friends)5.A:He is very hands
5、ome._ he play the role of the prince?B:No,he _ _.cant play the role of theCanprince1.-_ I go out to play,mum?-No,you_.You should do your homework first.A.Might;wouldnt B.May;had better not C.Must;mustnt D.Need;mustntB2.-Where is Emma?-I cant say for sure where she is,but she_ be out shopping.A.can B.should C.must D.mayD4.How_ you say that you really understand the whole story if you have covered only part of the article?A.can B.must C.need D.mayAThank You!Thank You!
