初中 初一 英语7BU Grammar：Modal verbs 7BU6 Elecricity Period Grammar 教学课件

1、老师:明 珠年级:七年级学科:英 语深圳市龙华区第二实验学校Unit 6 ElectricityPeriod 4 Grammar1definition and common rulesWhat is the modal verb?We must keep electrical appliances away from water. We must hold the plug when we plug in or remove the plug.We mustnt play near power lines and electrical equipment. We mustnt swim whe

2、n it is lightning and raining.In the last class, we learned some electrical safety tips：What if I remove the must and mustnt?The speakers mood and attitude changed without modal verbs!dontdontShe buys electricity in packets.She must buy electricity in packets.She can buy electricity in packets.She m

3、ay buy electricity in packets.情态动词表示说话人对动作的情感态度情态动词不单独出现，需与动词原形连用情态动词一般没有人称和数的变化What is the modal verb?1definition and common rulesIn this class, we will learn modal verbs:mustcanmayDaisy and Benny have to stay at home by themselves. Lets find out how they spend their day at home.A day at homeDaisys

4、 parents are on businessFocus on how they use must, can, may in conversations.2the sceneA day at home Daisy! Wake up! You must have a look at your room. Its in a mess! Sorry. Ill tidy it up. Must I take out all the trash? No, you neednt. Ill take it out after breakfast. But you mustnt mess up the ro

5、om again.3must/mustntFind out the usages- must观察must 此时表示什么？To tell people what to do or what not to do.肯定句： You must take out all the trash.否定句： You must not/mustnt do that.一般疑问句: Must I take out all the trash?回答： Yes, you must./ No, you neednt.句式变化You must have a look at your room. You mustnt mess

6、 up the room again.Must I take out all the trash?No, you neednt.必须主语+must+动原主语+must not/ mustnt+动原Must+主语+动原(must提前)肯定回答must,否定要用neednt3must/mustntDrills看图片，用must造句，并进行句式变换。肯定句:_when we come back from the outside.否定句:_when we come back from the outside.一般疑问句:_when we come back from the outside?回答：_W

7、e must wash our handsWe must not /mustnt wash our handsMust we wash our handsYes, we must./ No, we neednt.3must/mustntA day at home Sorry sweeties, can you two cook by yourselves? I cannot cook for you. Your father and I wont be back until this weekend. Oh, dont worry Mum. We can take good care of o

8、urselves!4can/cantA day at home Benny, can you help me with the lunch? Its difficult to cook!Yes, I can. Take it easy! Im coming! 4can/cantFind out the usages- can观察can此时表示什么？To express abilities.To make a request and give permission.肯定句：I can cook for you. 否定句：I cannot/ cant cook for you. 一般疑问句: Ca

9、n you cook for me?回答： Yes, I can./ No, I cannot/ cant.句式变化We can take good care of ourselves! I cannot cook for you. Can you help me with the lunch?Yes, I can.能力/请求许可主语+can+动原主语+cannot/ cant+动原Can+主语+动原(Can提前)肯定can,否定cant4can/cantDrills根据左侧图片，用can或cannot补全对话。4can/cantBenny: Daisy, _ you wash your ha

10、nds correctly like Mum and Dad do?Daisy: Yes, I _ wash my hands in a right way! Mum taught me before.Benny: Cool! _ you teach me how to do it? Because I _ do it well.Daisy: Yes, you _ practice with me. cannot/cantcancancanCanA day at home Sis, its 5:00 p.m. now! May I watch the TV for a while? No, y

11、ou may not. But you may do that after washing the dishes!5may/may notFind out the usages- may观察may 此时表示什么？To make a request and give permission. 肯定句：You may do that. 否定句： You may not do that. 一般疑问句: May I do that?回答： Yes, you may/can. No, you may not/cant.句式变化May I watch the TV for a while? You may

12、do that after washing the dishes! No, you may not.请求许可主语+may+动原主语+may not+动原May+主语+动原(may提前)可与can, cant互换5may/may not非正式语境中，may也可用can替代Drills5may/may notMay/CanMay/CancanMay/CanCanCan也可以用于请求许可，但may更礼貌些疑问句中，may一般放在I前使用More to learnmust:一定（一般仅用于肯定句，不用于否定句和疑问句，有把握的推测）e.g. You must be very tired. Lets t

13、ake a rest right now!may：可能（不用于疑问句中，没有把握的推测）e.g. You may be very tired. How about taking a rest.cant: 不可能(一般用于否定句中，有把握的推测）e.g. You cant be tired. You took a rest just now!6more to learnmust, may, can 表推测cant be 0%may bemust be 100%possibilities1._ I finish the work now ?No, you _.2.Dont worry. You _

14、 return me this book tomorrow.3.My grandma is ill. You _ talk so loudly here .4.I cant play with you. I _finish my homework first.5.I_ get up early tomorrow. because I have a meeting.6._you please open the window? 7. Lily _ be in the classroom. I saw her there just now!maycantmustmustCanMust neednt 7practiceChallenge OneFill the blanks with must, can or may.mustWhat do these signs mean? （You mustnt smoke here.）（You mustnt climb this ladder.）（You mustnt swim here.）（You mustnt use your mobile phone here.）Challeng