Unit 2 Healthy eating Grammar情态动词课件（31张PPT）

课件31张PPT。Grammar and UsageModal verbs
情态动词　情态动词表示推测不表示推测can could
may might
shall should
must
will would
ought tohave to
dare (daren’t)
need (needn’t)
used to一. We use modal verbs to talk about —— fun_ction (作用)1. Ability （能力）
2. Duty （义务）
3. Possibility （可能性）
4. Intention （意图、打算）
5. Guessing (猜测)1. Something terrible must have happened.
2. We should protect the world peace.
3. I'll help you lose weight.
4. What could have happened?
5. ...he could win his customers back.
ability duty possibility intention guessingpossibilitydutyabilityintentionguessingSAM— How can I grow thinner, Mum?
MUM— Well, you _________ eat food with plenty of fibre that helps you digest better. And you ________ stop drinking cola or eating sweet food.
SAM— Does it mean I ___________ eat my favourite fried chicken any more?
MUM— Not exactly, if you love fried chicken, you _________ give it up. Just eat it less often. You ________ worry too much: a little fried chicken ________ do you good.
ought / oughtn't to should /should not mustn't
needn't (don't) have to will can/ can'thave to should can't needn't shouldn't
needn't
don't haveto will Charles—I wish I could see things clearly in the dark.
Tom— Eating carrots _________ help you see better. You __________ eat some every day.
ought / oughtn't to should /should not mustn't
needn't (don't) have to will can/ can'twill should 考点一 dare 和 needdare和need 既可做情态动词，也可做实义动词，用作情态动词时，它只有一种形式,接动词原形; 作实义动词时，它有动词的全部形式。情态动词need 和dare的否定
need ---- needn't /need not
dare ---- daren't / dare not实义动词need 和dare的否定
need ---- don't / didn't/ doesn't need
dare ---- don't / didn't/ doesn't dare疑问句？ 考点一 dare 和 needdare和need 既可做情态动词，也可做实义动词，用作情态动词时，它只有一种形式,接动词原形; 作实义动词时，它有动词的全部形式。He daren't escape.Dare we escape ?He doesn't dare to escape.You needn’t come so early. He needs to finish his homework today. 判断是情态动词还是实义动词情态动词情态动词情态动词实义动词实义动词He daren’t speak English before such a crowd, dare he?判断正误:
He daren’t to speak English before such a crowd, did he?These dishes need be cleaned carefully.
These dishes need to be cleaned carefully.
These dishes need cleaning carefully.need doing
need to be done这些自行车需要修理。These bicycles need repairing. These bicycles need to be repaired.need doing
need to be done
need ， want , require 表需要
sth. need to be done = sth. need doing
sth. want to be done = sth. want doing
sth. require to be done = sth. require doingThe library needs ____, but it will have to wait until Sunday.
A. cleaning B. be cleaning
C.clean D. being cleanedA注意对need问句的回答:
--Need I finish the work today?
--Yes, ________________.
No, ________________.
No, ________________.you mustyou needn’tyou don’t have toneedn’t 对其它情态动词的回答:
--Shall I tell John about it?
--No, you __________.

--Must we do it now?
--No, you __________.
needn’t
(don’t have to) needn’t
(don’t have to)mustn't 禁止1. You ________ go there alone; it is too dangerous. (mustn't / needn't )
2. From what you said, she ________ have told you all about it. (can / must)
3. ---Shall I leave the room so that you two can talk?
--- No, you ___________. ((mustn't / don't have to )mustn't mustdon't have to 考点二. “情态动词+have done”的用法
They said they might have missed the plane. may have done对过去某事的可能性猜测
You should have told me this news earlier. should have done 过去应该做而未做
She must have gone through a lot. must have done 对过去某事的十分肯定猜测
He could have walked our of the dessert. could have done 过去应该做(有能力)而未做“情态动词+have done”的用法（1）must have done 对过去某事的十分肯定猜测
（2）may/might have done 对过去某事的可能性猜测
（3）can’t/couldn’t have done 对过去某事的否定猜测
（4）should/ought to have done 过去应该做而未做
（5）shouldn’t/oughtn’t to have done
过去不应该做而实际上做了
（6）needn’t have done 本没有必要做的事实际却做了
（7）could have done
本来能够做的（有能力做）事实际却未做到
Let's have a try!PracticeWith so much work on hand, you ____to see the game last night.
A. mustn’t go B. could have gone
C. shouldn’t go D. shouldn’t have gone2. There was plenty of time. She ____.
A. mustn’t have hurried B. couldn’t have hurried
C. must not hurry D. needn’t have hurriedPractice3. –I saw Mary in the library yesterday. --You_____ her. She is still abroad.A. mustn’t see B. can’t have seen C. mustn’t have seen D. couldn’t see4. Aunt Mary______the train, otherwise she would have arrived here by now.A. must have missed
B. should have missedC. had missed
D. might missover幻灯片 32Translate the following English into Chinese returnYou?mustn’t?get?off?while?the?car?is?still? moving. 汽车在行驶过程中，你不能下车。 Lucky time !!!!!
You can get 2 points.returnreturn? — Must?I?finish?all?assignments?at?a?time? ??—Yes, you _________ .
No,?you_____________________. needn’t (don’t have to) mustRational Cloze(语法填空)return The road is wet. It ________________ (rain) last night. must have rained
You should have told him a week ago.
你本来应该在一周前告诉他的。returnHomeworkReview the usage of modal verbs and finish the exercise paper. Thank you!