Unit6 Electricity
Grammar同步练习
一、单选。
1.What _____ I do for you, madam?
A. may B. must C. can D. be able to
2. If you feel tired, you ____ sit on this chair and have a rest.
A. must B. can C. need D. can’t
3. — May I go to the cinema, Mum?
— Certainly. But you ____ be back by 11 o’clock.
A. can B. may C. must D. need
4.--Is Mr Brown driving here？
--I'm not sure．He ______ come by train．
A．may B．shall C．need D．must
5.—Must I hand in my book report today，Mr. Brown?
—No，you ________. The book report is due in two weeks.
A.can't B. mustn't C. shouldn't D. needn't
6.You ____ talk here. It is against the rules.
A. mustn’t B. must C. may not D. can
7. — ____ I watch TV now, Mum? I finished my homework.
— Yes, you ____.
A. Must, need B. May, can C. Need, need D. May, must
8.— ____ I do all the housework now?
— No, you ____. You can do it later.
A. Must, mustn’t B. Must, can’t
C. Must, may not D. Must, needn’t
二、情态动词may can must填空。
1. Nobody ____ live without air and water．
2. -- _____ he speak Chinese? --Yes，a little．
3. The book _____ be returned before Saturday．
4. -- _____ I come in? -- Yes，please．
5. You ____ give up smoking at once．It's bad for your health．
6. Excuse me，____ I ask you a question?
7. ____ you tell me where the station is?
8. The train will leave at half past six，so I ____ get there fifteen minutes earlier．
9.Jane, you ______ play with the knife. It’s very dangerous.
10.He _____ choose the red shirt because it makes him look handsome.
三、句型转换。
1.Can I help you ?(变为同义句)
________can I do ________?you?
2.You may go shopping with me. (改为一般疑问句)
________?________go shopping with you?
3.His father may be sleeping at home. (改为同义句)
________?his father is sleeping at home.
4.—Must we clean the classroom right now? (作否定回答)
—No, ________ ________.
5.Amy must finish her homework before 4:00 today. （改为否定句）
Amy________?________her homework before 4:00 today.
任务型阅读
I栏是5段关于图标的介绍，II栏是7个图标。请将这5段介绍与其相对应的图标配对。
I
________The letter "P" is for parking. Drivers may leave their cars here. If a driver wants to park his car and go to the shop, he will look for this sign.
________We can see these signs on a recorder. We can push "ON/OFF" to turn it on or off. If we want to play a tape and listen to music, we may push the key "PLAY". If we want the recorder to have a short stop, we may push "PAUSE".
________If we see "OPEN" on the door of a shop, we know it is business time. We may push the door open and get into the shop.
________If we see "CLOSED" on the door of a shop, we know it is not business time.
________As soon as a driver sees this sign, he or she must drive slowly and carefully, because he or she knows there may be a person near a crossing.
II
A. ??????B. ??????C.
D. ??????E. ??????F.
G.
Unit6 Electricity
Grammar同步练习答案
一、CBCADABD
二、1.can 2.Can 3.must 4.May/Can 5.must 6.May/Can 7.Can 8.must 9.mustn’t 10.may
三、1.【答案】 What；for
2.【答案】May；I
3.【答案】Maybe
4.【答案】 you；needn't
5.【答案】 needn't；finish
四、【答案】 C；G；E；F；D
课件25张PPT。牛津深圳版 七年级下Module3
Unit6 Electricity Grammar
Modal verbs
（can;may;must）Warming-upLet's watch a video.情态动词（Modal verbs）定义：表示说话人对动作的态度，比如：需要，可能，意愿，猜测或者怀疑等等。情态动词主要有下列： can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would)?情态动词主要特征：
1.具有助动词作用，可以用来构成否定句，疑问句及用于简单回答。
2.后接动词原形，接不带to的不定式。
3.无人称和数的变化。
e.g:-Can you/he/she/they/it sing English songs？ ...会唱英语歌吗？
-Yes ,I/he/she/they/it can. 是的，...会。
I/He/She/They/It can sing English songs....会唱英语歌.情态动词两要点
动词原形跟后面
说话语气较委婉
can能力may许可
must责任或义务
否定回答needn't换
should应该,would愿
have to 被迫表客观.【记忆口诀】一、情态动词cancan是情态动词，意思是“能; 可以”，不能独立作谓语，只能与其他动词(原形)一起构成谓语，且没有人称和数的变化。
◆can的主要用法 1)表能力，could为can的过去时。can与be able to的意义基本相同。但can只有一般现在时和一般过去时，而be able to能用于各种时态。
He ______________ at the age of four.
＝He ______________ at the age of four.他在四岁时就会游泳了。
I ______________ French.＝I ______________ speak French.
我会讲法语。could swimwas able to swimcanam able tocan2）用于征求意见
——Can /Could /May /Might I(we) do sth?
——Yes, you can/may. / Of course you can.
——No(Sorry), you can’t. /mustn’t.
注意：①此处的could和might都不表示过去，只是语气上的委婉，不用作回答。②否定回答中，表示对他人造成一定伤害或影响，或表示违反了某种规定或法律时，用mustn’t较好。
e.g. ——May I smoke here? ——I’m afraid you ___________ .
③表示过去能力时，could 提问，只能用could回答。
e.g. —Could you ride a bike when you were 4 years old?
—No,___________ . mustn'tI couldn't3）表提出意见或请求Can/Could you (please) do sth? = Would you (please) do sth? （此句型中some 不变any）在口语中常用OK，sure或certainly等作肯定回答；用sorry等作否定回答。
e.g. Could you please give me a hand?(译)_____________________
4）表示允许或承诺 =may
e.g. OK. You _____________come and find me at any time tomorrow.
明天任何时候到可以来找我。
5）表示有一定把握的推测，用于否定句和疑问句。此时can’t译为“不可能” 肯定句用must。表示没有把握的推测，用may /might。
e.g. —— The window is broken. Who did it?—— It ________ Mary.—— It__________ Mary. The window is in the men’s toilet. 你能帮我一下吗？may/canmust becan't beHi and Lo are talking about themselves. What are they saying? Read their conversation and then complete the statements below with Can or Cannot. 1. Hi _____ play football.
2. Lo _______ paint.
3. Hi _______ speak as many languages as Lo.
4. Both Hi and Lo _____ dance.
5. Lo ______ drive a car, but he ____ play chess.
6. Hi ____ swim, but he _______ play the guitar.cancancancancannotcannotcannotcannot二、情态动词maymay 表示“可以，可能”，否定形式may not，表示“不可以”。
may的主要用法 1） 表示没有把握的推测，“可能，也许”。可以指过去时间，也可以指现在时间，但语气更加不肯定。
e.g. 可能你是对的。
You _______ right. = Maybe you are right.
He _______（可能有） a lot of work to do.
= Maybe he _______ a lot of work to do.
2）表示请求 “我可以……吗？” 表示请求、许可，比can正式
e.g. You may /can go now.may bemay havehas—May I use your pen?
—Yes, you may. / Yes, please. / Go ahead.
—No, you can’t. / mustn’t.
在回答以may引起的问句时，多避免用这个词，而用其它方式，如Yes, please. / Certainly. / Please don’t ./ You’d better not. / No, you mustn’t.等，以免显得太严峻或不客气。
3）表示希望、祈求、祝愿，常可译为“祝愿”。通常是用may +主+V
如：May you succeed！祝你成功！
____________________________.祝你过得愉快。May you have a good timeDaisy is not feeling well today. Benny is at home with her. Read their conversation below. Fill the blanks with may or can. Benny: Yes. I ____. _____ I carry your bag for you?
Daisy: Yes, you may. That’s so kind of you, Benny. I’m
ready to go. _____ you open the door for me?
Benny: Yes, I can.
Daisy: Thanks. MaycanCanBenny: How are you feeling, Daisy?
Daisy: Not very well.
Benny: ____________ I get you a chair?
Daisy: Yes, thanks.
Benny: I’m going out. _____ I borrow your bicycle, Daisy?Daisy: Yes, you may. Before you go to meet your friends, can you come and see the doctor with me?MayMay/Can三、情态动词mustmust 表示“必须，肯定，一定”， 而否定形式mustn’t = must not则表示“______________”。
must的主要用法 1）表示必须，意思同have to。
e.g. Children mustn’t play on the road because it’s too dangerous.
—Must I do it now?——Yes, you _____________.
—No, you ______________(不必要). / No, you _____________.
(注意：以must开头的疑问句，肯定回答应用must，而否定回答则常用needn’t，意为“不需要、不必”，相当于don’t have to, 而不能用mustn’t。禁止；不准mustneedn'tdon't have to 他没必要离开这。 He doesn’t have to go away from here.
=He needn’t leave here.
区别：①must表达主观意愿的“必须”，have to表达客观上或按道理说“不得不”。
e.g. I must study hard.
It’s too late. I have to go now.
②must 没有人称和时态的变化，而have to有。
e.g. He had to walk back home because he lost all his money.
2）表示有把握的肯定句中的推测，“肯定，一定”，只用于肯定句
He ______________ ill. He looks so pale.??
他准是病了。他的脸色苍白。must be illDaisy saw a doctor. The doctor told her what to do and what not to do. Help her write down the doctor’s instructions. drink more water go to bed early
eat cold food share cups with others
go out alone take the medicine on timeI must drink more water.
______________________________
______________________________
I must not _____________________
______________________________
______________________________I must go to bed early.I must take the medicine on time.eat cold food.I must not go out alone.I must not share cups with others.易混点总结：1、can和may 均可用来表示征求意见或允许，意为“可以”，一般可互换使用。
2、can 和may 表可能性的区别
在肯定句中,用may表可能。
You had better ask the policeman. He may know.
你最好问警察,他可能知道。
在否定句中，若语气肯定，表示“不可能”时用can not；若语气不肯定，表示“可能不”时用may not。
Mr Li can’t be in the room. He has gone to Beijing for a visit.
李老师不可能在，他去北京度假了。2、maybe和may be
may为情态动词，后加动词原形be，用在句中;maybe为副词,“大概，也许”,相当于perhaps,用于句首。
He may be at home now.他现在可能在家。
=Maybe/Perhaps he is at home now.
3、can’t和mustn’t: 表否定推测时应用can’t, mustn’t表达“禁止、不允许”的含义，不是用来表推测的，在肯定句中must表推测，译为“一定”。1. (河北· 30)1 have travelled a lot. I ________ speak four languages.
A. can B. may C. must D. need
【解析】句意：我经常旅行。我能够说四种语言。本句强调说话的能力。故选A。中考链接A中考链接2. (上海·41)—________ I park my car here for a while?
—No，you mustn't. Do you see the sign “NO PARKING”？
A. Would B. May C. Must D. Should
【解析】句意：——我______在这儿停一会儿车吗？——不，一定不要。你看到“禁止停车”的标识牌了吗？由答语“No，you mustn't. Do you see the sign ‘NO PARKING’？”可推知，上句应是表示请求允许的问句。选项中只有may可以表示有礼貌的请求。故选B。B3. (江苏无锡·10)Life is like riding a bicycle. To keep your balance，you ________ keep moving.
A. can B. must C. can't D. mustn't
【解析】can能；must必须；can't(不能)；mustn't(不准)。句意：生活就像骑自行车，为了保持平衡，你必须(must)不停地运动。故选B。B4. (江苏盐城· 4)When a virus comes into our body，we get ill. The same thing ________also happen to a computer.
A. should B. need C. can D. must
【解析】句意：当病毒进入我们的身体，我们就会生病。电脑也会发生同样的事情。should “应当、应该”，强调责任、义务；need “需要”，作情态动词，通常用于否定句或疑问句；can “能，能够，会”，可表示可能；must “必须、应当”，强调主观要求。根据句意，表示“会、可能”，应用can，故选C。C5. (山东青岛· 12)We should keep quiet in the cinema. We ________ speak loudly.
A. can B. must C. needn't D. mustn't
【解析】句意：我们应在电影院保持安静。禁止大声说话。can可以，能；must必须；needn't没必要；mustn't禁止，不允许。故选D。D谢谢21世纪教育网（www.21cnjy.com) 中小学教育资源网站 有大把高质量资料？一线教师？一线教研员？
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