《情态动词can 和cannot; may和maynot ; must和mustn27t》由会员分享，可在线阅读，更多相关《情态动词can 和cannot; may和maynot ; must和mustn27t（6页珍藏版）》请在金锄头文库上搜索。
1、Model verbs 情态动词 情态动词本身有一定的词义，但需与动词原形一起使用， 给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法， 认为其可能，应该或必要等。 情态动词后面通常加动词原形。 A1 can and cannot 情态动词can 与cannot 我们用can 表示某人具备某种能力做某事。 如： I can play basketball. We can finish the work in 20 minutes. 其否定形式为cannot 或cant . 如: I cannot swim. Im afraid I cant think of more examp
2、les to support this argument. 疑问句中， 把can 提到句首， 将can 与主语的位置对调。 Can you speak any foreigner languages ? Can you solve this Maths problem ? Im sorry, I cantA2 may and may not 情态动词may 与may not 在请求对方的许可， 或是准许你做某事时， 常用情态动词may 和can. may 比较正式，can 较常用且更口语化一些。 如： May I leave work early today? 我今天可以早点下班吗？Yes,
3、may 你可以 You No, may not 你不可以 Can I open a window ? 我可以开扇窗吗？Yes, can 你可以 You No, cant 你不可以You may / can use my dictionary. 你可以用我的词典。You may not/ cannot use my computer. 你不可以用我的电脑。A3 must and must not 情态动词 must 与must not 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或表示很有必要做某事； 或在提出建议时使用， 意为“应该； 得”。 如:
4、We must obey the school rules. The windows are very dirty. I must clean them. We must go to the bank today. We havent got any money. Its a fantastic film. You must see it.must 的否定形式是mustnt, 表示“禁止”， “决不允许”，具有强制性。 如: I must hurry, I mustnt be late. You mustnt forget to phone Julia. must 用于一般疑问句中，其肯定和否
5、定回答应引起我们的注意。 Must I go now ? 我们现在一定要走吗？Yes, must 是的； 我们一定要走 we No， mustnt 不， 我们不可以走。 Must I finish reading the book this week ?Yes, must youNo, neednt典型例析（ ） 1. _ your American friend eat with chopsticks ?Yes, but he cant use them well.A. Can B. Should C. Must 【解析】 A 本句表示能力“ 会； 能够”， can 符合题意。（ ） 2.
6、Everyone _ go through the security check (安检) when entering the World Expo Park. A. can B. may C. must D. ought【解析】 C 本句表示“必须， 一定要”， must 符合题意。（ ） 3. The winners of the race is a tall and thin boy with glassed.Then it _ be my friend, Mike, who looks very fat.A. might B. cant C. dont D. Should【解析】 B
7、由上下文语境可知本句的意思是“那么他不可能是我的朋友”， 表推测“不可能”时用“cant”( ) 4. Must I go to the shop with you , Mum? Err I can make it myself, Mike. You _ go with me.A. mustnt B. shouldnt C. wouldnt D. neednt【解析】 D 由上下文语境可知本句的意思是“ 你没必要去”， 表示“不必要” 可用neednt 或dont have to( ) 5. This desk is too heavy. I _ move it. Could you help
8、 me ? No problem A. can B. cant C. should D. shouldnt【解析】B 句意为“这桌子太重， 我没法移动它。” 表示“没能力做某事”应用cant( ) 6. Must I finish my homework right now 、 No，you _.A. neednt B. may not C. mustnt D. cant【解析】 A 此处must 提问表示“必须” ， 否定回答只能用neednt 或dont have to .( ) 7. _I take some photos in the hall ? No， you _.A. Can;
9、neednt B. Must; mustntC. Could; wont D. May; mustnt【解析】D 句意： “ 我可以在大厅里照相吗？” “ 不， 不可以”。 表示请求许可时用can 或may, 其否定回答用cant 或mustnt( ) 8. _ I use your ruler, Lingling? Sure. Here you are.A. May B. Would C. Need D. Must【解析】A 根据句意“用一下你的尺子可以吗？” 可知此处是表示请求许可， 可用may 和can.考点专练一 用can , may 或must 的适当形式填空。1. _ I ask
10、you a question ? 2. Attending a ball _ be exciting. 3. Michael _ be a policeman, for hes much too short. 4. Are you coming to Jeffs party? Im not sure. I _ go to the concert instead.5. He never takes a taxi. He _ be very poor.6. I thought you _ like something to read, so I have brought you some book
11、s.7. Look! I _ stand on my hands.8. He _ have been to Shanghai. He knows so well about Shanghai.9. The play is not interesting. I really _ go now.10. She_ like this place.11. Could I take this seat, sir? Yes, you _.12. It _ be very hot in Shengyang in summer.13. I have just met her in the supermarke
12、t. She _ be in Shanghai now.14. Mary _ phone. If she does, could you ask her to ring later?15. _ you be happy and healthy.16. We _ spit in public.二 选择正确的情态动1.Baby _( can, cannot) run.2. Dogs _( can, cannot) understand simple orders.3词。1. A b. John practices running every day , so he _( can, cannot)
13、run very fast.4. You _( can, cannot) pass the test if you dont work hard.5. Camels _( can, cannot) live in the hot areas.6. Camels _( can, cannot) go without water for a long time.三 根据所给情景，仿照例句写出问句。1. The radio is very loud, and you and your brother are studying. A: May we turn off the radio? B: Yes, please turn it off.2. You and your friend see some lost tourists. A: _ B: Oh, yes, please help us.3. You see four of your friends playing basketball. A:
