2025-2026学年外研版八年级英语下册情态动词用法课件

情态动词 1 目录 DIRECTORY 01 can/could 02 may/might 03 must 04 have to 05 need 06 should 07 had better 2 一、can/could can - could （1） 能，能够 (表具备某种能力) could 表示过去的能力 I can play the piano very well. I could run fast last year. 4 can - could （2）可以 (表示请求或许可) No，you can’t. could 表示委婉语气 can/could开头的疑问句回答：肯定 - can；否定 - can’t Yes，I can. Can you help me？ Could you help me？ 5 can - could （3）可能 ，表推测。（肯定句中常用could表推测，can不用于肯定句表推测） can’t 不可能(语气肯定） He could be at home. The man cant’t be Tom. He has gone to Beijing. 练习 I can dance. Can I have dinner? He can be at home. He can’t stay at home. 表能力 表请求 他可能在家 ？ 表推测 二、may/might may/might May/Might come in? （1）可以，表示请求或允许。 might 表示委婉语气 No，you can't. Yes，you can. Yes，you may. may开头的疑问句的回答：肯定– can / may；否定– can't may not 9 He may/might know the answer. He may/might be at home. （2）可能 ，表示推测。 10 may not 可能不… 1.I may not like him. 2.It may not be a great suggestion 我可能不喜欢他 这可能不是个好的建议。 11 May you succeed! 祝你成功 （3）祝 ，表示祝愿。 12 may 的用法总结 可以，表示请求、允许 2. “可能” ，表示推测。 3.祝，表祝愿 -- Wow... another gift ! What's in the box? -- I'm not sure. It ______ be a pair of sports shoes. A. must B. may C. will D. need 2. -- Where are you going this month? -- We _______ go to Xiamen, but we're not sure. A. needn't B. must C. might D. mustn't C B 14 3. You mustn't go off on your own, because you _______ get lost in the mountains. should B. must C. need D. might 4.-- Do you have any plans for this weekend? -- I'm not sure. I ______ go climbing Mount Tai. must B. need C. may D. have to D C 15 三、must must （1）必须，表命令、义务等 We must work together. Must I go now? Yes, you must. No, you needn't. 注意：①must开头的疑问句，肯定回答用must，否定回答用needn’t或don’t have to. mustn’t ②mustn’t 表禁止 [补充]mustn’t 禁止 1. Your mother is sleeping, you mustn't talk. 你禁止说话。 2. You mustn't say things like that. 你千万别说那样的话。 3. You mustn't break your promise. 你一定不能违背诺言。 must （2）一定，表肯定推测 She must be sick, Alice thought. The light is on, so he must be at home. 注意：mustn’t不能表推测，mustn’t含义为禁止 must 的用法总结 必须，表命令，义务。注意否定回答 2. 一定，表推测 四、have to 情态动词 have to do sth 不得不做某事，必须做某事 have to 的用法总结 辨析 must & have to We must have a party sometime. but we have to finish our homework at first. must 必须（主观的） have to 不得不（被迫的） 五、need need 需要;否定needn’t 不需要，没必要; 注意： need开头的疑问句，肯定回答用must；否定回答用needn’t You needn’t go there yourself. Need I hand in my homework now? Yes, you must./No, you needn’t. 25 1. Need I clean the room?(作肯/否定回答) _____________ ______________ 2.Must I stay here after school?(作肯/否定回答) _____________ ______________ Yes,you must. No,you needn't. Yes,you must. No,you needn't. 或 No, you don't have to. 26 六、should should 应该，表示建议或劝告。shouldn’t不应该。 You should listen to the doctor’s advice. You shouldn’t eat too much junk food. 28 七、had better had better 最高，表示建议或劝告。 had better do sth 最好做某事 had better not do sth 最好不要做某事 You had better get up early. You had better not waste your time. 30 总结：推测大排名 肯定 否定 must may/might/could can’t may not 语气确定 31 1. --May I watch TV,Dad? --When your homework is finished,you______. A. shoulder B.can C.must D.need 2.--Must I come before 6:30 tomorrow? --No,you______.There will be plenty of time. A. mustn‘t B. can’t C. couldn't D.needn't B D 32 3.--_____ I swim here? --No.Children _____swim alone here. A. Can;mustn't B.Must;can't C. Need;can't D.may;must 4.--Students in our school______know shouting is not allowed in the library. A. must B.can C.may D.need A A 33 1.All the drivers _____ reduce speed when driving near the zebra crossing. A.can B.can't C.must D.mustn't 2.Now most young people like shopping online because they _____ spend a lot of time going from shop to shop. A.needn't B.can't C.mustn't D.shouldn't 3.— you go with me to Lang Lang's piano concert this evening? —I'd love to, but I have to study for my maths test. A.Should B.May C.Must D.Can C A D 34 4.—Must I be home before eight o'clock, Mum? —No, you . But you have to come back before ten o'clock. A.mustn't B.can't C.needn't D.couldn't 5.—Excuse me, sir. Visiting hours are over. You______ leave. —Pardon me, nurse. I didn't hear the bell. A.may B.can C.must D.need 6.Now most young people like shopping online because they spend ____ a lot of time going from shop to shop. A.needn't B.can't C.mustn't D.shouldn't C C A 35 7.—Could I invite my friends to the party on Saturday, Mum? —Of course you _______. That sounds great. A.may B.could C.must D.can 8.—Must I finish the work now? —No, you . You can finish it tomorrow. A.needn't B.mustn't C.can't D.shouldn't 9.You keep your room clean, or your mother will be angry with you. A.must B.might C.can't D.needn't 10.—Could I ride an electric bicycle to school, Mr Wang? —No, you _______. Students under the age of 16 aren't allowed to ride electric bicycles. A.couldn't B.needn't C.can't D.shouldn't D A A C 36 11.--_____ I swim here? --No.Children _____swim alone here. A. Can;mustn't B.Must;can't C. Need;can't D.may;must 12.--Students in our school______know shouting is not allowed in the library. A. must B.can C.may D.need A A 37 1. -- Are you going to the cinema tonight? -- I don’t know. I _____ go or I _____ stay at home. will; will B. must; must C. should; should D. might; might 2. You ____ set out alone, or you ___ get lost in the jungle. A. needn't; may B. mustn't; might C. can't; need D. mustn't; must D B 38 3. -- Where is Linda? -- She ______ be in the school library, but I'm not sure. A. might B. need C. should D. must 4. -- Is Mike coming to the talent show tomorrow? -- I'm sure that he ______ come . must B. can C. may D. should A A 39 $