Unit 6 Electricity Everywhere Grammar Modal words 课件 2025-2026学年沪教版英语七年级下册

Unit 6 Electricity Everywhere P4-Grammar Modal words 400852912 1 Daisy talks about some interesting things without electricity. Look at the pictures and see what Daisy can do. Daisy can… swim dance sing cook ride a bicycle Lead in What can/can’t you do? I can… I can’t/can not… play basketball play badminton play the guitar draw ski drive a car play chess Lead in Please watch a video and find out as many modal verbs as possible! Lead in Lead in Modal verbs Modal verbs情态动词 can cannot (can’t) may may not must must not ability 能 obligation 必须 permission 可以 Observe and think 1. What is the form of the verbs after modal verbs? 2. What does the modal verb mean in each sentence? I can play badminton ski drive a car I can’t (can not) play basketball draw play chess 用法:表示具有某种能力“能、会” We use can to say we are able to do something. We use cannot (can't) to say we are unable to do something. Can + V原形 = be able to do can’t + V原形 =be unable to do can and cannot Why do we use them? Presentation 情态动词can的用法 can ① be able to “能”，表示能力。 我可以唱一首英语歌曲。 I can / am able to sing an English song. ② 表示许可或请求对方允许，意为“可以”。 我可以用你的字典吗？ Can I use your dictionary? ③ 过去式：could 我十年前就能做到那样。 I could do that 10 years ago. ④ 否定式：cannot = can’t Presentation Peter can speak English. 否定 → Peter can’t / cannot speak English. 一般疑问句 → Can Peter speak English? （一般疑问句，提前情态动词） 特殊疑问句 → What can Peter speak? ⑤ could是can的过去式，但表示请求许可时，could和can不表示时态的区别，只是could的语气更加委婉，用could提出的请求要用can来回答。 Presentation 情态动词can的用法 Daisy is going to see her teacher. She is standing at the doorway of the teacher’s office. What should she say? May/Can I come in? Presentation Daisy is going to ask the teacher a question. May/Can I ask you a question? What should she say? Presentation Daisy is at school. She is going to call her Dad with the telephone at school. What should she say? May/Can I use the phone? Presentation Daisy is now at home. She is thinking whether she can watch TV. What should she say? May/Can I watch TV? Presentation Daisy is thirsty. She is asking her Dad for some drinking water. What should she say? May/Can I have some drinking water? Presentation May/Can I use your mobile phone？ Yes, you may/can. No, you may not/can't. You may/can turn on the TV. You may not/cannot play in the kitchen. may and may not 用法: 表示允许、许可、请求，“可以”， 相当于can We use may and may not to ask for and give permission (许可). In less formal situations, we also use can and cannot (can‘t) for the same purpose (目的). may (not) + V原形 区别在于：表示请求许可时，may更能表示礼貌或敬意 Why do we use them? Presentation maybe may be Maybe we can go to swim together. Your homework may be in your schoolbag. maybe adv. “大概、也许” may be 情态动词+be动词“可能是” Presentation Daisy and Benny are now talking about how to use electricity safely. Let’s find out what they are. turn on; wet hands; mustn’t You mustn’t turn on the TV with wet hands. play; near; You mustn’t play near the heater. You mustn’t touch the light with wet towel. touch；mustn’t; wet towel Presentation Daisy and Benny are now talking about how to use electricity safely. Let’s find out what they are. You must be careful with electricity. must; careful; electricity; You must make sure the food is microwave safe before you put it into a microwave. must; microwave safe; before; make sure; put; Presentation must and must not Why do we use them? You must be careful with electricity. You mustn’t turn on the TV with wet hand. You mustn’t play near the heater. You mustn’t touch the light with wet towel. You must make sure the object is microwave safe before you put it into a microwave. 用法：must 表示制定规则/发出命令 “必须” mustn’t 表示禁止“不准” We use must to tell people what to do We use must not (mustn't) to tell people what not to do. must/mustn’t + V原形 Presentation --Must I hand in my homework today? --Yes, you must. --No, you needn’t/ don’t have to. Presentation How to answer the question with ”must “? What do these signs mean? You mustn’t smoke here. You mustn’t fish here. You mustn’t use your mobile phone here. You mustn’t take photos. Presentation 辨析must和have to 意义 形式 用法 must “必须；一定” 只有must 强调主观上必须做某事 have to “ 不得不；必须” have有各种时态和数 强调客观上不得不做某事 Presentation 含义：情态动词是一种本身有一定的词义，表示说话人的情绪，态度或语气的动词，但不能单独作谓语，只能和其他动词原形构成谓语。 1. 情态动词________（有/无）人称和数的变化； 2. 情态动词后面跟的动词须用________； 3. 否定式构成是在情态动词后面加 “________”。 4. 使用一般疑问句只需把情态动词_____________,其余不变,句号改为问号。 无 原形 not 置于句首 Summary 情态动词 用法 否定形式 疑问句及回答 共同点 can 表示具有某种能力，意为“能”，非正式场合也可以表示许可，相当于“may” cannot/ can’t 不能 --Can...? --Yes,...can. --No,...can't. 情态动词后要使用动词原形 may 表示请求，允许，意为“可以” may not 不可以 --May...? --Yes,...may. --No,...may not/ can’t/mustn’t. must 用来指定规则或者发出命令，意为”必须“ must not/ mustn’t 禁止 --Must...? --Yes,...must. --No,...needn’t/ don’t have to. can/may can can/may can/may can Exercise can can can can may/can must Can can’t must mustn’t/can’t must can’t P139 Can can must mustn’t/can’t mustn’t/can’t May/Can can/may may/can must must You must listen carefully to the teachers. You mustn’t sleep in class. You must keep the classroom clean. You mustn’t throw rubbish on the floor. Must can can’t must Can can’t May mustn’t can’t can’t can Must mustn’t C B C D C C B A D C A D B C D 33 Thank you! Lavf58.30.100 $