英语必修 第二册Unit 2 Let's celebrate!教学ppt课件

这是一份英语必修 第二册Unit 2 Let's celebrate!教学ppt课件，共26页。PPT课件主要包含了Unit 2 ，could， Ready，情态动词表推测，他可能在家，很可能，仅仅可能而已，或许非常不确定，夏天不可能下雪，你不能对父母说谎等内容，欢迎下载使用。
Let's celebrate!
a That is why Letters frm Father Christmas culd be the perfect The children must have been very excited as they pen it.c ... they might nt receive their presents if they were nt gd.
The wrds in red are ___________.What d the wrds in red indicate: an rder, a request, ability r pssibility?
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”?
The speaker is quite sure abut the statement.
“Culd” and “might” have a similar meaning when indicating pssibility.
The speaker is nt sure abut the statement, and it's nly a pssibility.
It's impssible fr the children t receive their presents.
1.The letters were als beautifully-illustrated-each must have taken its true authr, Tlkien, a lng time t cmplete.2. In anther letter, Father Christmas cmplained abut hw he culd nt stp his helpers playing games with the tys instead f wrapping them up.3. ... ther characters at the Nrth Ple, we can share the true spirit f giving at Christmas time.4. ... Tlkien may have been the real Father Christmas.
1.The letters were als beautifully-illustrated-each _______________(take) its true authr, Tlkien, a lng time t cmplete.2. In anther letter, Father Christmas cmplained abut hw he ____________ (stp) his helpers playing games with the tys instead f wrapping them up.3. ... ther characters at the Nrth Ple, we ___________ (share) the true spirit f giving at Christmas time.4. ... Tlkien ______________ (be) the real Father Christmas.
Fill in the blanks with apprpriate wrds.
culd nt stp
must have taken
may have been
Fcus n 基本用法
情态动词must, can, culd, may, might等都有表推测的用法，都可以对过去，现在或将来的情况是否发生做出语气强弱不同的推测。
根据推测语气的强弱，选择情态动词。
1. 在肯定句中表推测:
(1) Yu must tell me all abut yur new friend.
(2) He culd be at hme. He may be at hme. He might be at hme.
你必须告诉我有关你新朋友的一切。
culd, may, might语气依次减弱，表示“可能， 也许”。
must语气最强， 表示“肯定，一定”；
2. 在否定句中表推测:
(1) It can't snw in summer.
may/might nt语气较弱，表示“可能不”；
mustn't表示“禁止”，不用于否定推测。
我们可能哪里也去不成。
(2) We might nt g anywhere.
Yu mustn't tell a lie t parents.
can't, culdn't语气较强，表示“不可能”；
3. 在疑问句中表推测:
(1) Culd he have finished the task?
他可能把任务完成了吗？
(2) Can he be at hme nw?
（语气较为委婉，可能性较小）
疑问句中用can/culd（能……？），culd语气更加委婉不确定。
情态动词表推测的三种时态。
1.“情态动词+be/be ding/动词原形”表达对现在情况或此时此刻正在发生的事情的推测。
(3) He must wrk very hard. (= I'm sure he generally wrks very hard.)
(2) They may nt be having fun.(= I dn't think they are having fun.)
(1) He can't be at hme at this time.(= I dn't think he is at hme at this time.)
这个时候他不可能在家。
2.“情态动词+动词原形”表达对将来情况的推测。 
(1) She must arrive befre 5. (= I'm sure she will arrive befre 5.)
(2) She may walk miles and miles amng the hills withut meeting anyne. (= It's prbable that she walk miles and miles amng the hills withut meeting anyne. )
她可能会在山里一连走好几英里都遇不到一个人。
(1)may/might have dne
3.“情态动词+have +V-ed”
① They might have gt lst.② Yu may have misheard her ─ I'm sure she didn't mean that.
表示对已发生事情的不肯定推测
你可能听错她的话了——我肯定她不是这个意思。
① Emma must have been very upset.② I think we must have taken a wrng turning smewhere.
(2)must have dne
表示对已发生情况的推测，通常用于肯定句
我觉得我们一定是在什么地方拐错了路。
might比may更加不确定
① Yu can’t have frgtten her.② Where can she have put it?
(3)can have dne
表示对已发生情况的推测，通常用于否定句或疑问句
她到底把它放在哪儿了呢？
① Culd she have frgtten my address?② He culd nt have been mre than 16 at that time.
(4)culd have dne
表示对过去情况的推测，多用于否定句或疑问句
他当时不可能超过16岁。
情态动词表推测时的反意疑问句、 附加疑问句部分一般不再用情态动词表示推测语气。而是根据情态动词之后的动词及时间状语或上下文确定具体形式。
(1) That girl must be yur sister, isn't she?
(2) He must have left yesterday, didn't he?
那个女孩一定是你的妹妹，是吗?
他昨天一定走了，是吗?
Rewrite the underlined sentences in the cnversatin using can/ culd, may/ might and must.
Pssible answers!
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.
1.（2022 天津卷3月）It used t be that yu ___ drive fr miles here withut seeing anther persn, but nw there are huses and peple everywhere.A. need B. shuld C. culd D. must
4.（2018 天津卷）I can't find my purse. I ___ it in the supermarket yesterday, but I'm nt sure.A. shuld leaveB. must have leftC. might leaveD. culd have left
2.（2019 天津卷）My wallet was gne. _________________________________.（我只可能把它落在了G9公共汽车上。）
I culd nly have left it n the G9 bus
3.（2018 北京卷）In tday's infrmatin age, the lss f data ____ cause serius prblems fr a cmpany.A. needB. shuld C. can D. must
注：另附wrd文档，点此链接。
Ⅰ. 选择括号内适当的内容填空。
1. It is t late t g back. We _________(may/must) g n. 2. The temperature in the muntains _________ (must/can) be very lw at night, s yu'd better take sme mre clthes. 3. The light is nt n. The Greens _________ (mustn't/can't) be at hme nw. 4. He said he _________(might/can) cme tmrrw, but I am nt sure abut that. 5. Yur sister bught s much fruit. She _________ (must/shall) like eating it.
Ⅱ. 根据汉语提示完成句子。
1. Yur sn ___________________(可能正在做) his hmewrk at hme nw. 2. It _________________(肯定是) David, because he has just called me saying that he will visit us. 3. Since the rad is wet, it _________________(肯定下雨了) last night.4. He __________________________(不可能迷路). I drew him a map.5. Mary ____________________(可能不知道) the secret.
may / might be ding
must have rained
can't / culdn't have gt lst
may / might nt knw
Ⅲ. 用can, must或might的适当形式完成对话。
1. —Are yu ging t attend the get-tgether this weekend? —I'm nt sure. I _________ g back t my hmetwn. 2. —Alice wn first prize in the physics cntest yesterday. —Really? She _________ be very happy. 3. —What d yu think f Mr White? —He is a bad-tempered fellw, but he _________ be friendly when he wishes.
4. —The 14-year-ld girl wn a gld medal at the Olympic Games. —She _________ have trained very hard befre the match. 5. —I saw Nancy in the street. —It _______________ have been her, fr she has gne t Shanghai fr a business meeting.
can't / culdn't
Can yu use the fllwing mdal verbs fr pssibiliy crrectly?can/must/may/might/culd