Unit 8 It must belong to Carla. Section A Grammar Focus课件(共32张PPT)

(共32张PPT)
Section A
Grammar Focus
Translate the phrases.
outside the window have fun
next-door neighbor
at first
run away
feel uneasy
have no idea
have fun (in) doing sth.
在窗外
玩得高兴
隔壁邻居
最初； 首先
逃跑
心神不安
一点不知道； 没办法
做某事很愉快
--- Whose volleyball is this
--- It must be Carla’s. She loves volleyball.
--- Whose book is this
--- It must be Mary’s. J.K. Rowling is her favorite writer.
--- Whose hair band is this
--- It could be Mei’s.
Read the sentences below, paying attention to the colored parts.
--- Whose notebook is this
--- It must be Ming’s. It has her name on it.
--- Whose French book is this
--- It could be Carol’s. She studies French.
--- Whose guitar is this
--- It might belong to Alice. She plays the guitar.
--- Whose T-shirt is this
--- It can’t be John’s. It is too small for him.
Read more sentences.
must
can’t
could
might
100%
probably true
20%-80%
possibly true
0
almost not true
表示推测的情态动词
在英语中，表示对某件事物的确定程度，即表示推测的时候，我们通常会用到以下情态动词: must, might, could, may, can’t, couldn’t。
一. can和could的区别和用法
1. can表示体力和脑力方面的能力, 或根据客观条件能做某种动作的“能力”。
　 Can you speak English？　　
　 can用在否定句和疑问句中时有时表示说话人的 “猜测”或 “不肯定”。
Can the news be true？
　 (在日常会话中, can可代替may表示“允许”, may比较正式)
2. could 是 can的过去式, 表示过去有过的能力和可能性, 还有怀疑和不肯定的意思(在否定和疑问句中)。
She couldn’t skate when she was five years old.　 （能力）
At that time we thought the story could be true. （可能性）
could用来提问, 是有礼貌的请求 Could.... Please 语气较为婉转。
Could I speak to Mr. Smith, please
二. might和may的区别和用法:
1. may的用法:
　 a. 表示”允许”或”请求”。
May I come in？
在使用这一用法时需注意: may表示“允许”的否定形式是must not, 意思是“不应该、不许可”。
　—May I take this book out of the reading room
　—No, you mustn’t.
b. 表示说话人的猜测，认为某一事情“或许”或“可能”发生。　
He may know the answer.
c. may用在感叹句中可表示祝愿、愿望。
May you succeed. 祝你成功。
May you have a pleasant journey.
一路平安。
2. might的用法:
a. might可以代替may, 表示现在时间的动作，但语气较为婉转客气或更加不肯定。
　 Might I offer a suggestion？
　 b. might用来表示现在时间时, 还可表示”规劝”。
　 You might pay more attention to spoken
English.
三. must与have to的区别
　 have to比较强调客观需要, must着重说明主观看法，另外have to能用于更多时态。比较下面的句子：
My brother was seriously ill, so I had to call the doctor in the middle of the night.
(客观上需要做这件事)
He said that they must work hard.
（主观上要做这件事）
有时两者都可以用, 意思差别不大。
We must / have to leave now.
must在表示说话人对事物的推测时，它比may肯定得多, 相当于汉语的“一定”或“准是”。(只有在肯定句中能这样用。)
This must be your room.
在回答由must引起的问题时, 如果是否定的答复，不能用mustn’t, 而需要用needn’t或don’t have to, 因为mustn’t是“一定不要”的意思，表示禁止。
-- Must I hand in my homework now
-- No, you needn’t.
情态动词表示推测可以分为以下几种情况:
★情态动词+ do 此结构表示对现在或将来情况的推测和判断
—Do you know where she is now
—I think she might travel in Beijing.
★情态动词+ be doing 此结构表示对现在或将来正在进行的情况的推测和判断。
At this moment, my father can’t be working in the office.
★情态动词+ have done 此结构表示对过去情况的推测和判断。
The road is wet. It must have rained last night.
★情态动词+ have been doing 此结构表示对过去正在进行的情况的推测和判断。
Your mother must have been looking for you at that moment.
根据句意, 从方框中选择正确的情态动词填空, 每项限用一次。
should, must, can’t, may not, mustn’t
1. That ______ be Lucy. She has gone to Beijing on business.
2. There _________ be something wrong with my watch. It isn’t working now.
can’t
must
3. He ________ know the answer, either.
Let’s ask that policeman.
4. You _______ swim in the river. It’s
dangerous.
5. You ________ look after your parents
when they become older. It’s your duty.
may not
mustn’t
should
用must, might, could或can’t 填空
The toy car _______ be Jim’s. He is the
only kid at the picnic.
2. This Mp5 _______ be Linda’s. I know she has one.
3. The mobile phone _______ belong to
Lucy or Lily. They both have mobile
phones.
4. The man _______ be Mr Smith. He has
gone to Shanghai and he’ll be back in
three days.
must
could / might
could / might
can’t
4a Choose the best way to complete each sentence using the words in brackets.
The keys:
might be
could be
could be
can be
could be
A: Many people are wearing coats.
B: The weather must be _______________.
2. A: Sally has been coughing a lot.
B: She might be _______________________.
3. A: This restaurant is always crowded.
B: The food _______________.
4. A: Whenever I try to read this book, I feel sleepy.
B: It can’t ___________________________.
4b Complete these responses.
might be
could be
could be
could be
Look at the two rooms below. Make guesses about the owner of each room.
【浙江湖州】 — Who’s singing in the next room
— It ____ be her. She has gone to New York.
A. can’t B. must
C. shouldn’t D. can
【解析】考查情态动词表推测。表示否定推测时，用can’t，意为“一定不……”。must表示推测时，意为“一定……”，用于肯定句；根据答语“她已经去了纽约”可知是否定推测，故选A。
【2011湖北黄冈】41. —Whose T - shirt is this
—It ______ be John' s. It’s ______ small for him.
A. can't; much too B. can't; too much
C. mustn't; much too
D. mustn't; too much
【解析】情态动词的用法。根据句意“它不可能是约翰的，对他来说太小了。”故排除C、D，too much为“太多”的意思，much too为“太”。故选A。
【2013天津】— Where are you going this month
— We______ go to Xiamen, but we're not sure.
A. needn’t B. must
C. might D. mustn't
【解析】 needn’t (不必)表建议； must (一定)表猜测的可能性很大； might (可能，也许)表不是很肯定的猜测。 mustn't(不允许)表命令。句意：---这个月你们将去哪？---我们或许去厦门，但还不确定。
C
【2013福建泉州】--- Have you decided where to go for your summer vacation
--- Not yet. We _______ go to Qingdao. It's a good place for vacation.
A. may B. need C. must
【解析】句意：--- 你已经决定到哪里过暑假了吗？--- 还没有呢，我们也许去青岛，那是个度假的好地方。情态动词表示推测时，may表“可能”，must表“一定”，can’t表“不可能”。
A
【2014铜仁】— Must I water the flowers now, mum
—No, you ______. You _____ do it later.
A. mustn’t; must B. mustn’t; may
C. needn’t; may D. needn’t; must
【2014连云港】— ______ I know by what time you want the project to be done
—By the day after tomorrow. ______ you finish it on time
A. May; Can B. Must; Need
C. Could; Must D. Need; Would
C
A
【2014长沙】—Who’s singing in the garden
—It ______ be Mr. Brown. He always practices singing at this time.
A. must B. can’t C. need
【2014河北】I ______ follow you. Would you please repeat it
A. can’t B. mustn’t
C. needn’t D. shouldn’t
A
A