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外研版 (2019)必修 第二册Unit 2 Let's celebrate!精品ppt课件
展开Mdals(2)Lk at the sentences frm the reading passage and answer the questins.What d the wrds in bld indicate:an rder,a request,ability r pssibility?
a That is why Letters frm Father Christmas culd be the perfect bk... b The children must have been very excited as they pened it. c might nt receive their presents if they were nt gd.
The wrds in bld indicate pssibility.
2 Will the meaning f sentence(a)change if we replace “culd” with “must” r “might”? What happens if we change “must” and “might” in sentences(b)and(c) int “culd”? Nw lk fr mre sentences with mdals in the reading passage.
If we replace “culd” with “must”,the meaning f sentence(a)will change. It means the speaker is quite sure abut the statement. If we replace “culd” with “might”,the meaning f sentence(a)will remain mre r less the same. “Culd” and “might” in affirmative sentences have a similar meaning when indicating pssibility.
If we change “must” in sentence(b)int “culd”,it means the speaker is nt sure abut the statement,and it’s nly a pssibility. If we change “might” in sentence(c)int “culd”,it means it’s impssible fr the children t receive their presents.
Rewrite the underlined sentences in the cnversatin using can/ culd,may/might and must. (At a fancy dress party.) Chris:I spent ages putting up all the ballns and flwers last night. Jean: I expect yu are feeling tired nw! Chris:Yes,I am. Lk,that guy is dressed as Batman. Is that Mike? Jean: It’s pssibly him. Check ut that girl ver there. I’m sure that’s Lucy. Chris:N,I dn’t think that’s Lucy. Lucy isn’t that tall. Jean: Lk at thse tw guys dressed as chickens! Oh,they’re waving at us! Maybe they’re frm ur schl. Chris:Let’s g and find ut.
>教材习题答案Yu must be tired nw! It may/might/culd be him. That must be Lucy. that can’t be Lucy. They may/might/culd be frm ur schl.
Lk at the picture and make as many sentences as pssible using can /culd ,may /might and must .
Black Friday is ne f the busiest shpping days f the year. Stres have big sales and pen their drs very early.
>教材习题答案The wman in red must be very excited t buy s many things. The man with a wallet in his hand might be a bit reluctant t pay. The wman with glasses may be very tired t get up s early and carry s many bags. The cashier might be feeling uncmfrtable as he is sweating a lt.
单元语法 情态动词(2) 1 can 与culd (1)表示能力,常译为“能,会”。culd 是 can 的过去式,表示过去 的能力。She can speak French fluently.她能讲一口流利的法语。 Our daughter culd walk when she was eleven mnths ld. 我们的女儿十一个月时就会走路了。(2)表示请求或许可,常译为“可以”。culd 比can 的语气更加委婉。Yu can take the car,if yu want. 如果想用那辆车,你就尽管用吧。
(3)表示可能性,常用于疑问句或否定句中,指“某事是否为事实”。用于肯定的陈述句中,表示理论上的可能性,意为“有时可能会”。—Can/Culd she be in the classrm? 她可能在教室里吗? —N,she can’t/culdn’t. 不,她不可能(在教室里)。He is cnfident a slutin can be fund. 他确信能找到解决办法。 (4)表示惊讶、不相信等,常用于否定句或疑问句中。This can’t be the right rad.不可能是这条路。 【学法点拨】 (1)can’t/culdn’t have dne 表示对过去情况的否定推测,意为“不可能做了某事”。(2)culd have dne 既可表示对过去的推测,也可表示“过去本可以做某事(而实际上未做)”。
◆选词填空(can/culd) (1)I can speak English,but I speak Japanese. (2)She play several instruments at the age f eight. (3)—Can/Culd I use yur studi? —Of curse yu . (4)Anybdy make mistakes in his r her career. (5) she still be alive after all this time? (6)It be quite cld at night here. (7) yu tell me when yu’ll be back? (8)What he be ding at this time f night? (9)I saw her just nw. She have gne t Beijing. (10)He have passed the exam,but he was t careless.
can’t/culdn’t
2 must (1)表示“必须”,否定形式 mustn’t 表示“不准,禁止”。Yu must be hme by 11 ’clck. 你必须在 11 点之前回家。 Yu mustn’t smke here. 你不准在这里吸烟。 —Must I tell her? 我必须告诉她吗? —Yes,yu must. 是的,你必须。(或N,yu needn’t/dn’t have t. 不,你不必。)
(2)表示肯定推测,意为“一定,肯定”,只能用于肯定句中。表推测时must 的否定形式是can’t/culdn’t。He must be nearly 90 years ld nw. 他现在肯定将近 90 岁了。 Smene must have used my umbrella yesterday. I fund it wet. 昨天一定是有人用了我的伞,我发现它是湿的。(3)表示“偏要,偏偏”,常指不愉快的事。If yu must g,at least wait until the strm is ver. 如果你一定要走,至少要等到暴风雨过去。
◆完成句子(1)All passengers (必须系) seat belts. (2)Cars (禁止停放) in frnt f the entrance.(3)— (我们必须完成) the wrk tday? —N,yu dn’t have t. (4)Yu (一定饿了) after all that walking. (5)I’m srry,she’s nt here. She (准是走了)already. (6) (你为什么非要) always interrupt me?
must nt be parked
Must we finish
must be hungry
must have left
Why must yu
3 may 与might (1)表示请求或许可,常译成“可以”。might 表示请求时语气更加委婉。A reader may brrw up t six bks at a time. 读者一次最多可借阅6 本书。—May I cme in? 我可以进来吗? —Yes,yu may/can. 是的,你可以。(或N,yu can’t/mustn’t. 不,你不能。) (2)表示可能性,意为“也许,可能,大概”,might 比may 的可能性要 小。may/might nt 表示“可能不”。Dn’t g any clser — it might nt be safe. 别再走近了——那可能不安全。He may have missed his train. 他可能没赶上火车。
(3)may 常用于祈使句中,表示祝愿。May yu succeed! 祝你成功! 【误区警示】 can/culd 与may/might 均可表示“可能性”,在肯定句中意思相近,在否定句中含义不同。can’t/culdn’t 表示“不可能”,may nt/ might nt 表示“可能不”。
◆选词填空(may/might) (1)Yu keep the bk fr tw weeks. (2)I wnder if I speak t yur sn. (3)—May I brrw yur newspaper? —Yes,yu . (4)Let’s speed up,r we be late. (5)He earn his living by painting,but he is nt sure. (6) yu have a lng and fruitful marriage. ◆完成句子(7)汤姆不可能知道这个秘密。Tm ___________________________________________________________________________. (8)汤姆可能不知道这个秘密。Tm ___________________________________________________________________________.
can’t/culdn’t knw the secret
may nt/ might nt knw the secret
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