情态动词 can 的用法 1. 表示能力 指有做某事的技能或本领，后面接动词原形，无人称和数的变化。 例：I can speak English. （我会说英语。） 否定形式：can not（缩写为 can’t）+ 动词原形 → I can’t swim. （我不会游泳。） 疑问形式：Can + 主语 + 动词原形？ → Can you ride a bike （你会骑自行车吗？） 2. 表示请求许可 用于礼貌地向别人借东西或提出请求，语气委婉。 例：Can I use your ruler （我能用一下你的尺子吗？） 礼貌表达可加 please → Can I open the window, please （请问我能开窗吗？） 3. 表示可能性 指客观上存在的可能性，多用于肯定句和否定句。 例：The story can be true. （这个故事可能是真的。） 否定推测更常用 → It can’t be a cat. （它不可能是一只猫。） 4. 表示提议/帮助 主动提出为他人做某事，让对方获得帮助。 例：I can help you with your English homework. （我可以帮你做英语作业。） 小提示: - can 没有人称和数的变化，主语是 he, she, it 时，依然用 can。 - can 的过去式是 could，语气更委婉或描述过去的能力。 课堂小测 一、单项选择。 ( )1. Maybe he can ____in their basketball team. A.is B.be C.are D.am ( )2.I_____sing English songs. A.is B.be C.are D.can ( )3. - Can you play the violin -But I can sing. A.Yes,I do. B. No, I don't. C. Yes,I can. D. No,I can't. ( )4.-Can you swim or play chess -_____ A.Yes,I am. B.Yes,I can. C. I can swim. D.I don't know. ( )5. Can she____basketball A.plays B. play C. playing D. play the ( )6.Tom can play the guitar but he_____play it very well. A.can B. can't C. not D. don't ( )7.- Can I help you -____.I can do it by myself. A.Yes,please. B. Sorry. C. Very good. D.No,thanks. ( )8.-Can your sister sing 一 _____ A.Yes, he can. B.Yes, he does. C.No, she doesn't. D.Yes, she can. ( )9.-Can you paint or sing -一_____ A.Yes, I can. B.No, I can't. C.I can sing. D.I like singing. ( )10.She___Chinese and she can_____a little English. A.speaks;speaks B.speak;speak C.speaks;speak D.speak;speaks ( )11.-What can you do, Lin Tao -一_____ I like sports. B.I want to join the music club C.I am well. D.I can play the drums. ( )12.Can you____ A.swim B.swimming C. swims D.swam ( )13._____you write them A.Can B. Do C.Are ( )14.__ you tell me more about Chinatown A.What B. Can C. How ( ) 15.Super girl___cook. A.is B. isn't C. can't ( )16.-Why _____you come to the party, Danny -Because I have a piano lesson. A.are B. aren't C. can D. can't ( )17. I can ride a bike, but my little sister ___. A.can't B. can C. doesn't ( )18._____he cook the meal A.Do B. Can C. Is ( )19.He _____clean the floor, but he_____clean the windows. A.can; can B. can't; can't C. can't; can ( )20.-_____you swim fast -Yes, I can. A.Do B.Are C.Can ( )21.-What_____John____ -He can do some kung fu. A.is, doing B. does, do C. can, do ( )22.-_____you jump here -Yes, I can. A.Can B. Are C. Do ( )23. The rabbits ___run, but the fish ____run. A.can;can B. can't; can C. can; can't ( )24. What_you do for the party A.are B. is C. can ( ) 25.You___ride fast. I'm the winner. A.can B. are C. can't ( ) 26.You_____ go by plane. A.aren't B. can't C. isn't ( ) 27. What_____you do A.are B. does C. can ( ) 28 ... ...
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