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1、,1. can 的用法 (1)表邀请。 若接受邀请，回答为： OK./All right./Sure./ Of course./Certainly./ Yes (Sure), Id love (like) to. 若不接受邀请，回答为： Sorry,cant. + 原因,invitation,e.g. Can you come to the party? Yes/ Sure, Id love/like to. Sorry, I cant. I have to help my parents.,其他表邀请的句型: Could /Will/Would you come to the party?
2、Would you like /love to come to the party? I hope you come to the party.,Please come to the party. How/What about coming to the party? (2)表能力“能，会” 否定句 cant不能 e.g. He can swim, but I cant. How long can you stay under water? (3)在否定句，疑问句中表示“不可能”或“一定不” e.g. Can he come ? No, he cant come.,2. 情态动词“have to”与其他的情态动词如：“can” , “may” “must”和 “should” 不同。 （1）这4个情态动词没有人称和数的变化,而have to有。它的第三人称单数为“has to” ,过去时为had to.,（2）这4个情态动词在一般疑问句中将它们放在句首, 在否定句中直接在他们后边加not即可。,如：He should study hard . He has to study hard .,
