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初中英语牛津版 (深圳&广州)七年级下册Module3 Natural elementsUnit 6 Electricity优秀ppt课件
展开Talk abut what we can d t save electricity:
We shuld turn ff the lights in the daytime in rder t save electricity.
We must clse the dr f the fridge after using it.
We must set the temperature at 26 degrees centigrade in the ffice r at hme.
1. —— Can yu get me a packet f electricity? —— Yes, I can.2. She can't buy electricity in packets like sweets!3. Yu mustn't say that, Benny!4. —— Can yu remember? —— Yes, I can.5. We must leave the fridge n all the time.
Read the sentences and pay attentin t the red wrds:
Presentatin
Mdal verbs (情态动词)
定义:是一种本身有一定词义,表示说话人的情绪、态度或语气的动词。特点:1. 无人称和数的变化 2. 后面须接动词原形一起作谓语 3. 否定式在其后加“nt”
1. can, culd 1) 表示能力(体力、知识、技能)。 eg. Can yu lift this heavy bx? 此时可用be able t代替。can只有一般现在时和一般过去式;而be able t则有更多的时态。 eg. I’ll nt be able t cme this afternn. 当表示“经过努力才得以做成功某事”时应用be able t,不能用can。 eg. He was able t g t the party yesterday evening in spite f the heavy rain.
2) 表示请求和允许。 eg. —— Can I g nw? —— Yes, yu can. / N, yu can’t. 此时可与may互换。在疑问句中还可用culd, might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中。 eg. —— Culd I cme t see yu tmrrw? —— Yes, yu can. ( N, I’m afraid nt. )
3) 表示客观可能性(客观原因形成的能力)。 eg. This hall can hld 500 peple at least. 4) 表示推测(惊讶、怀疑、不相信的态度),用于疑问句、否定句和感叹句中。 eg. This can’t be dne by him. Hw can this be true?
We use the mdal verbs can and cannt (can't) t say we are able r unable t d smething.
We can use electricity t make many things.We cannt/can’t see electricity.Can yu think f an example?Yes, I can. /N, I cannt/can’t.
Chse the crrect answers:
1. My classmate is jumping s far! I ______ believe my eyes.A. shuldn't B. needn't C. mustn't D. can't 2. Dirty air and water are harmful. They ______ kill plants, and even peple.A. can B. can't C. shuld D. shuldn't
Hi and L are talking abut themselves. What are they saying? Read their cnversatin and then cmplete the statements belw with can r cannt.
1. Hi ______ play ftball.2. L ______ paint.3. Hi ______ speak as many languages as L.4. Bth Hi and L ______ dance.5. L ______ drive a car, but he ______ play chess.6. Hi ______ swim, but he ______ play the guitar.
2. may, might 1) 表示请求和允许。might比 may语气更委婉,而不是过去式。否定回答时可用can’t或mustn’t,表示“不可以,禁止”。 eg. —— Might/ May I smke in this rm? —— N, yu mustn’t. —— May/Might I take this bk ut f the rm? —— Yes, yu can. (N, yu can’t / mustn’t. ) 用May I...?征徇对方许可时比较正式和客气,而用Can I...?在口语中更常见。
2)用于祈使句,表示祝愿。 eg. May yu succeed! 3)表示推测、可能性(不用于疑问句)。 might不是过去式,它所表示的可能性比may小。 eg. He may /might be very busy nw. Yur mther may /might nt knw the truth.
We use may and may nt t ask fr and give permissin. In less frmal situatins, sme peple like t use can and cannt(can't) fr the same purpse.
May/ Can I use yur mbile phne?Yes, yu may/ can.N, yu may nt/ can't.Yu may/ can turn n the TV.Yu may nt/ cannt play in the kitchen.
1. —— Wh is singing in the next rm? —— It ______ be Lisa, but I'm nt sure.A. must B. may C. need 2. The man ______ be a dctr in this hspital, but I'm nt sure.A. must B. wuld C. can D. might3. The girl in the music rm ______ be Celia. She has gne t the dining hall.A. can’t B. must C. may
Daisy is nt feeling well tday. Benny is at hme with her. Read their cnversatin belw. Fill the blanks with may r can.
Benny: Hw are yu feeling, Daisy?Daisy: Nt very well.Benny: ____ I get yu a chair?Daisy: Yes, thanks.Benny: I’m ging ut. ____ I brrw yur bicycle, Daisy?Daisy: Yes, yu may. Befre yu g t meet yur friends, can yu cme and see the dctr with me?
Benny: Yes. I ____. ______ I carry yur bag fr yu?Daisy: Yes, yu may. That’s s kind f yu, Benny. I’m ready t g.____ yu pen the dr fr me?Benny: Yes, I can.Daisy: Thanks.
3. must 1) 表示必须、必要。 Yu must cme in time. 在回答引出的问句时,如果是否定的,不能用mustn’t(禁止,不准),而用needn’t, dn’t have t(不必). eg. —— Must we hand in ur exercise bks tday? —— Yes, yu must. —— N, yu dn’t have t / yu needn’t.
2) must是说话人的主观看法,而have t则强调客观需要。Must只有一般现在时,have t 有更多的时态形式。 eg. He play isn’t interesting, I really must g nw. I had t wrk when I was yur age. 3) 表示推测、可能性(只用于肯定的陈述句) eg. Yu’re Tm’s gd friend, s yu must knw what he likes best. Yur mther must be waiting fr yu nw.
We use must and must nt/ mustn't t tell peple what t d r what nt t d.
Yu must nt/ mustn't d that, Benny!We must always be careful with electricity.They must nt/ mustn't play near the heater.
After mdal verbs such as can, may and must, we use (the base frm/ the -ing frm/ the -ed frm) f a verb.
Wrk ut the rule
1. Buses ______ stp when the traffic lights turn red.A. can B. may C. must 2. We shuld keep quiet in the library. We ______ speak ludly.A. must B. mustn't C. can D. needn't3. He _______ like cffee. I see him drink a cup at times.A. must B. may C. can’t D. mustn’t
Daisy saw a dctr. The dctr tld her what t d and what d nt d. Help her write dwn the dctr’s instructins.
drink mre water g t bed early eat cld fd share cups with thers g ut alne take the medicine n time
I must drink mre water.____________________________________________________________
I must g t bed early.
I must take the medicine n time.
4. I must nt _____________________5. ______________________________6. ______________________________
eat cld fd.
I must nt g ut alne.
I must nt share cups with thers.
S1 say, the ther students listen and d:
Fr example:Yu must sit dwn!Yu can’t tuch yur muth!...
Lk at the pictures and discuss what we must r mustn’t d.
情态动词定义:表示说话人的情绪、态度或语气的动词。特点:1. 无人称和数的变化 2. 后面须接动词原形一起作谓语 3. 否定式在其后加“nt”can: 能may: 可以,可能must: 必须、必要
1. Jhn____ cme t see us tnight, but he isn’t very sure yet. A.may B.can C.must 2. —— Is Tm at hme nw? —— He _____ be at hme nw.Because I _____ his rm just nw,and he answered.A. must;called B. can’t;phne C. must;phned
3. Students in ur schl _______ knw shuting is nt allwed in the library.A. shuldn't B. mustn't C. must4. With the help f the new technlgy,yu _______ e-mail yur friends by mbile phne.A. can B. must C. need5. —— Hw d yu usually g t schl? —— My schl is far away. I _____ take the bus t schl.A. must B. might C. have t
Fill in the blanks using can,can’t,may,may nt,must, mustn’t:
1. Yu needn’t return the bk nw. Yu ______ keep it until (直到) next week if yu like. 2. ——_______ I stp my car here? ——N, yu may nt.
3. I tld her the news by email tw weeks ag, s she _______ knw it. 4. I am afraid we _______ give yu an answer. 5. Jhn, yu _______ play with the knife. Yu _______ hurt yurself.
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