高中英语外研版必修4Module 6 Unexplained Mysteries of the Nature World备课ppt课件

这是一份高中英语外研版必修4Module 6 Unexplained Mysteries of the Nature World备课ppt课件，共38页。PPT课件主要包含了unlikely，a b，maymight，should， maymight，must，maymight ，can等内容，欢迎下载使用。

Mdule 6 Unexplained Mysteries f the Natural Wrld
T talk abut pssibility and imprbability.T learn the use f may have/ might have.
Talking abut pssibility and imprbability
a. Many peple think the mnster may be related t Nessie.b. They think there might be similar creatures in ther lakes.c. Scientists say the lake is unlikely t be able t supprt such a big creature.
Lk at the sentences and answer the questins.
1. Which sentences say that smething is pssible?
2. Which sentences say that smething is impssible?
3. Which wrd is fllwed by t + verb?
may: 可能会, 或许会
e.g. 1. It may be a new species. 它可能是一种新的物种。 2. He may nt be there. 他或许不在那儿。
might: 可能, 或许 (语气较may更不肯定)3. His suggestin might be wrth thinking abut. 他的建议或许值得考虑。4. I have gt a lt f bks that might interest yu. 我有许多或许你感兴趣的书。
unlikely: 可能性不大的(形容词)5. She is unlikely t arrive befre 7. 7点钟前她可能到不了。6. It is unlikely that he gt injured. 他不大可能受伤。
Rewrite the sentences using the wrds in brackets.
Example: Perhaps that snake is dangerus. (may) That snake may be dangerus.
1. Perhaps there are still dinsaurs smewhere. (might)
There might still be dinsaurs smewhere.
2. Dn’t g near the water. Perhaps it’s very deep. (may)
Dn’t g near the water. It may be very deep.
3. We prbably wn’t see the mnster. (unlikely)
We are unlikely t see the mnster.
4. Perhaps there is an undergrund river frm Lch Ness t the sea. (may)
There may be an undergrund river frm Lch Ness t the sea.
5. We must help him – perhaps he can’t swim! (may)
We must help him – he may nt be able t swim.
6. There are prbably lts f strange creatures in that lake. (likely)
There are likely t be lts f strange creatures in that lake.
Identify the creatures. Use may r might.
情态动词 + have dne
Read the sentences frm the interview f Listening.
a. The dinsaurs may have stpped evlving, and been unable t adapt t changes in the climate.b. They might have killed each ther.
We use may have r might have (with the past participle) t talk abut ____.1. smething which happened in the past – perhaps.2. smething which is impssible.3. smething which may happen in the future.
情态动词may / might用法
1. may / might表示推测，“可能，或 许”，其中might表示的可能性较小， 含义更不确定。
2. may“可以”，用于表示说话人同意、许可做某事。 might表示过去的“允许”。3. 在疑问句中用于征询对方的许可，肯定回答常用may，否定回答常用may nt / mustn’t。
e.g. 1) I may be late, s dn’t wait fr me.2) That might be ur taxi (but I am nt sure).3) The directr is alne nw. S yu may see him nw.4) She said he might brrw her dictinary.5) —May/Might I smke in this rm? —Yes, yu may. / N, yu may nt / mustn’t.
【拓展】may / might表示推测时还可用进行式或完成式。e.g. They may / might be waiting at the statin. They may / might have called while yu were ut.
1. Jack didn’t cme n time. He may / might have missed the bus. may／might have dne表示对已经发生过的情况的肯定推测，意为“可能发生了某事”，语气稍弱。 e.g. Jhn isn’t at hme. I think he may/might have gne t schl. 约翰不在家，我想他可能去上 学了吧。
2. Since nbdy gave him any help, he must have dne the research n his wn. must have dne表示对过去已经发生过的情况的肯定推测，意为“一定做过某事”，语气较强。 e.g. It must have rained last night, fr the rad is quite muddy. 昨晚一定下雨了，因为路面很泥 泞。
3. —Srry, Mum! I failed the jb interview again. —Oh, it’s t bad. Yu shuld have made better preparatins. Instead yu spent all yur time playing cmputer games. shuld have dne表示“本应该做某事，而实际上并没有做”。 e.g. I really regret wasting the hurs when I shuld have studied hard, but it is t late. 我真的很后悔该努力学习的时候浪费了太 多时间，但现在太晚了。
4. I shuldn’t have watched that mvie — it’ll give me hrrible dreams. shuldn’t have dne表示“本不应该做某事，而实际上却做了”，含有批评、责备或惋惜的意思。 e.g. Lk, Tm is crying. I shuldn’t have been s strict with him. 看，汤姆哭了，我本来不应该对 他如此严厉。
5. I needn’t have wrried befre I came t the new schl, fr my classmates here are friendly t me. needn’t have dne表示“本不必做某事，而实际上却做了”。 e.g. It’s nly five minutes’ walk. We needn’t have taken a taxi. 只有五分钟的步行路程，我们本不 必乘出租车的。
6. He culd have escaped, but he chse t stand and fight. culd have dne表示“过去本来能够做某事，而实际上没有做”。 e.g. Mr. Smith can’t have gne t Beijing, fr I saw him in the library just nw. 史密斯先生不可能去北京了，我刚 才还在图书馆见过他。
7. —Why are yur eyes s red? Yu can’t / culdn’t have slept well last night. —Yeah, I stayed up late writing a reprt. can’t / culdn’t have dne表示“过去不 可能做了某事”。
【语境应用】用情态动词补全下面对话。Lucia: I wnder where Peter’s gt t. He said he’d be here in time fr lunch. I’m rather wrried.Helen: Dn’t wrry! He 1. __________ still cme.Lucia: I dubt it. It’s past 2 ’clck. I think he 2. ________ have rung me up! But he didn’t!
Helen: Maybe his bss culdn’t give him time ff, after all!Lucia: Yes, that’s pssible, I suppse. Or he 3. __________ have had an accident! D yu think I shuld phne the plice?Helen: Dear me, n! Dn’t fuss (大惊小怪)!
He 4. _________ be n his way right nw!(Ten minutes later, the phne rings.)Peter: Srry, Lucia, but I can’t get away frm the ffice. An urgent piece f wrk. It 5. __________ be 8 r 9 when I get hme. Lucia: OK. Then I’m sure yu 6. _______ have had yur lunch, right?Peter: Yes. My bss gave me a treat (款待).
1. In tday’s infrmatin age, the lss f data _______ cause serius prblems fr a cmpany. (2018北京) 2. I can't find my purse. I _____________ (leave) it in the supermarket yesterday, but I'm nt sure. (2018天津)
culd have left
3. It’s strange that he _______ have taken the bks withut the wner’s permissin. (2018江苏)
4. Gerge _____ t far. His cffee is still warm. (2016浙江) A. must have gne B. might have gne C. can’t have gne D. needn’t have gne
5. I ______ have wrried befre I came t the new schl, fr my classmates here are very friendly t me. (2015天津) A. mightn’t B. mustn’t C. needn’t D. culdn’t
情态动词＋have dne该结构一般有两个主要用法：一是表示对过去发生的动作或状态的推测，二是表示对过去发生的动作的遗憾或责备。
Cmplete the sentences using may have / might have and the crrect frm f the verbs in brackets. (Tw f them shuld be in the passive vice.)
1. The meterite _________________ (cause) a huge dust clud.
might have caused
2. The dust clud __________________ (cut ff) the sunlight.3. Small animals ___________________ (survive) by eating nuts and seeds.4. The dinsaurs ___________________ (kill) by vlcanic eruptins.
might have cut ff
may have survived
might have been killed
Finish Exercise 3 n page 55, then cmpare yur ideas in a grup f fur.Think f sme mre reasns why the dinsaurs might have disappeared. Use may have/ might have. Share yur ideas with the rest f the class, and decide which are the best.