can 1 I can dance I cant cannot

can的用法 1. 表示一种能力 肯定句： I can dance. 否定句： I can’t (cannot) dance. 一般疑问句：Can 肯定回答： Yes, you dance？ I can. 否定回答： No, I can’t. 2. 许可 You can borrow my bike tomorrow. 3. 猜测（用于疑问句、否定句） --Can it be true? --It can’t be true.

may的用法 1. 表示许可 肯定句： You may sit down. 否定句： You may not sit down. 一般疑问句： May they come in ? 肯定回答： Yes, they may. 否定回答： No, they may not. 反义疑问句： I may borrow this book, mayn’t I? 2. 猜测，可能性 He can’t know the truth. 他不可能知道真相。 He may not know the truth. 他可能不知道真相。

must的用法 1. 表示必须、一定 肯定句： You must turn it on. 否定句： You must not turn it on. 一般疑问句： 1. --Must we obey the traffic rules? --Yes, we must. 2. --Must I take my umbrella? --No, you needn’t. 2. 猜测(用于肯定句中) It’s 10 o’clock. My mother must be angry.

1. A: Must I return the book tomorrow? B: No, you _______. You can keep it until Friday. A. mustn't B. needn't C. shouldn't D. can't 2. I _______ walk home last night. There were no buses. A. can B. may C. must D. had to 不得不 must用以表示“必须做某事”或“一定要做某事”， 具有强制性，表达一种责任或义务。 而have to 侧重强调这种“义务”或“责任”源于某种情况或规 定，并非说话者本人能够控制。

表示猜测的三个情态动词： must (肯定） ， may(可能） ， can’t( 不可能） 1. Carol _____ get very bored in her job. She does the same thing every day. A. may B. can C. must D. need 2. I saw Mary at the street just now, she _______ be at the library. A. may B. mustn’t C. can’t D. must 3. The ground is wet, it ______ rain just now. A. may B. can C. must D. need