can在肯定句中表示“有时候会” 注 指一种客观的可能性.常用来说明人或事物特征
• 1.Accident can happen on such rainy days. •2.Even experienced teachers can make mistakes. 3.Children can be naughty.
(3) may + 主语+ 动词原形 “祝某人/ 物…”不用might May you succeed in the coming exam! May our friendship last forever! 祝您美梦成真。 May all your dreams come true. 祝您的生活美满幸福。 May you live a happy life.
• 1.----Is Jack on duty today? ----It __ be him. It’s his turn tomorrow. A. mustn’t B. won’t C. can’t D. needn’t • 2. Well, he __ have gone far– his coat is still here. A. shouldn’t B. mustn’t C. can’t D. wouldn’t
• 3. Who______ it be at this time of day? • A can B may •4.He is very busy. He______ be watching TV at home. A may not B can’t
• 5.The climate of the south_____ be rather cold in winter. • A would B can C must
• 3. ---Mr. Brown is on time for everything .How can he be so late for the important meeting? • Can 表示“惊讶，怀疑，不相信” 的态度（否定句和疑问句）
• 4.1) Can (可能) the news be true? _____ • ---- It ______ be true.(不可能) Can’t 2) He could (may\might) (可能) be _______________ on his way home now. • Can 表示猜测的“可能”，用于 否定句 疑问句 _______ ______, “could”用于 比 Can 弱 肯定句 否定句 疑问句 ______,_____,_____(语气_______)
may not have done这是情态动词的完成时态，表 示“可能没有完成
Can/Could • 2. ----__________ I use your bicycle? • ---- Of course, you_______. can • ----No ,you _______ can’t
口语中can, could表示“许可”, could 的语气比 can委婉，但答语中不用 could而用 can.
可能性
• 4）-- Why hasn’t Jack come back yet?____ anything have happened to him? ---- I am not sure , but I guess something ________ happened. A May; must have B Can; might have
• may \ might • 1)表示许可或征询对方许可 May \Might • ---_________ I use your telephone? may • --- Yes , you ______. • --- No , you _______. mustn’t
• 2) 表 推测 “可能”，用于肯定句和否定句
• 1） He may\ might ____________ (可能) come today, but I’m not sure. • 2) This may not __________ be done by him.(可能不) • 3) I thought you _____ like something to read, so I bought some books for you. 只有宾语从句中 • A. may B might might表过去的
1.
can和could
Many of us can use the computer now, but we couldn’t ten years ago. * 能力 (1)表“_____”,指现在和将来用___ can could 指过去用_____.
• 1. The baby will ____ walk in a few months. • A can B could C be able to • 2. The fire spread very quickly, but luckily everyone ______ get out. A. had to B would C. could D. was able to
6.---- ____I use your bicycle? ---- Of course, you____.
A. Can ;could B Could ; can
• 7. He said that I _____use the phone. • A may B might • 8. The man looks energetic, so he _____ be ill. A may not B can’t
• The World Wide Web is sometimes jokingly called the World Wide Wait because it __ be very slow. A. should B. must C. will D. can
• We _____ go to the cinema tonight, but we are not sure. • A. can B may C must
can 表示一个人长期的能力,be able to是表示一个较短暂的过程
• can 和be able to 都可以表示 能力.can泛指一般的能力,而且 只有两种形式,即:can, could．be able to 则主要指具 体做到了某件事的能力，其形 式主要是靠be 发生变化，所以 形式比can 多
Notice: may / might not 可能不（语气不肯定） can / could not 不可能（语气肯定） 1. He may not be ill. 他可能没病。 2. He can not be ill. 他不可能有病。
9.Helen ___ go on the trip with us, but she isn’t quite sure yet. A. Shall B. must C. may D. can 10.We ___ have proved great adventurers, but we have done the greatest march ever made in the past ten years. A. needn’t B. may not C. shouldn’t D. mustn’t
情态动词
1.Exercising alone can be boring.
2.I don’t know where she is, she may be in Wuhan. 3.You mighe could have a cup of coffee.