情态动词重难点大盘点.pptVIP

情态动词重难点大盘点 shall 1）shall用于第一、第三人称的疑问句中，表示说话人征求对方的意见或向对方请示 例：Mr. Thomas, a friend of yours, wants to see you. Shall he come in or wait outside? 比较：Will he come in or wait outside? Shall he come in…=Do you want/wish him to come in… Will he come in…=Does he want/wish to come in… 2）shall用于第二、第三人称陈述句，表示说话人给对方的命令、警告、允诺或威胁等。 He shall be punished if he goes on behaving badly. (I am threatening him.) If you listen to me, dear, you shall get some candies. (I promise you.) You shan’t go to the party if you don’t finish your homework first. (I am warning you!) 即时练习： 《双语报》27期B4版Grammar Work 2.The interest _____ be divided into five parts, according to the agreement made by both sides,” declared the judge. 4.Tell him he _____have an answer tomorrow. 10.It has been announced that candidates _____remain in their seats until all the papers have been collected. should 请思考：在下面的句子中should是什么意思？ It is strange that you should believe such a dishonest person as him. 上句中的should是“竟然”、“居然”的意思 另外还有以下句型： It is strange /surprising /amazing/ amusing /funny /ridiculous/ unbelieveable that sb should do sth 即时练习： 《双语报》27期B4版Grammar Work: 11. You can’t imagine that such a well-behaved gentleman should be so rude to a lady. can/could 1.表能力或客观可能性 A computer can’t think for itself.（能力） I could sing very well when I was five.（能力） Sometimes the dog can be dangerous.（客观可能性） 2.表请求和允许 Could/Can I come to see you tomorrow? Yes, you can.（不能用could回答） 3.表示猜测（用于否定、疑问和感叹句中） The phone is ringing. But who can it be? It can’t be Jenny. She has gone home already. can/could和be able to的异同： I’ll not be able to come this afternoon. = I can’t come this afternoon. 当表示现在或过去的能力时，两者可互换。 例句：Look, I can stand on my head! 结论1.表示正在发生的动作时，用can而不用be able to 例句：Even though I’d hurt my leg I was able to swim back to the boat. Although it took quite a lot of efforts, the firefighters was finally able to rescue the cat from the roof. 这两个例句中因为动作以在一个过去的具体时间成功地完成，并不是表示能力，因此不能用could，但可以用 managed to或succeeded in或一般过去时代替 结论2.表示过去发生的一个成功完成的具体