情态动词课件(共17张PPT)

(共17张PPT)
情态动词
情态动词表达说话人的情感、态度或语气，主要包括能力、可能、命令、要求、许诺、建议等。
常见的情态动词有：can, could, may, might, will, would, should, must, have to, need等等。
你发现了哪些情态动词？
Can I help you
You should wear an apron.
Tears may run down your face.
You must be careful with the knife.
You shouldn’t cut it so fast.
It could get burned.
The pizza must be ready now.
Could you pass me the ketchup, please
Would you like some more
情态动词+其他动词原形
a verb group
情态动词不能单独作谓语
情态动词的其他典型特征
①大多数情态动词没有人称和数的变化（have to除外）。
You must be careful with the knife.
The pizza must be ready now.
③大多数情态动词时态性不强，可以用于过去、现在或将来，个别情态动词有现在式和过去式两种形式，如：can-could, may-might.
He could play the piano when he was seven years old.
②大多数情态动词可以直接否定或提前（have to除外）。
You shouldn’t cut it so fast.
Would you like some more
常用情态动词的基本用法
can/could
①表示具有某种能力，意为“会，能”。
Alice can ride a bike.
→Alice could ride a bike when she was six.
②表示推测、可能性，意为“可能”。
It could get burned.
③表示请求、许可，意为“可以”
Can/Could I ask you a question
could是can的过去式
could比can语气更委婉
That girl can’t be Mary because she is in hospital.
注意：can表推测常用于否定句或疑问句
may/might
①表示请求、许可，意为“可以”。
May I use your computer
I wonder if I might use your computer.
may用于表达请求时，只能用于主语是I的一般疑问句中。
②表示推测、可能性，意为“可能”,might可能性更小一些。
Tears may run down your face.
注意：肯定回答用may/can, 否定回答用can't/mustn’t.
③may还可以用于表示祝愿。
May God bless you! 愿上帝保佑你！
must /have to
①must表示主观看法，意为“必须，一定”，而have to强调客观上的必要性，意为“不得不”。
You must wash your hands before you eat.吃东西前你必须先洗手。
We have to wear school uniforms at school. 我们在学校必须穿校服。
②must表推测（有把握的、肯定的推测），意为“一定，肯定”。
The pizza must be ready now.
两者还有其他区别吗？
must /have to的其他区别
① must→mustn’t; have to→don’t have to
② Must I... → Yes, you must. → No, you needn’t/ you don’t have to.
③ have to 有人称和时态的变化
My mother has to do a lot of housework.
Do we have to stay at home
I had to stay in bed yesterday because I hurt my leg.
will/would
①表示意愿或打算，此时would是will的过去式。
I will go to the cinema with Tina tomorrow.
Tina asked if I would go to the cinema with her.
②表示征求意见、提出请求。
Will / Would you help me
would比will语气委婉
③would有时与like/love/prefer等连用，表示提出建议或邀请。
Would you like some more
I will not clean the room for you.
should
表示劝告、建议，或者责任、义务，意为“应该，应当”。
You shouldn’t cut it so fast. 你不该切得那么快。
You should wear an apron. 你应该戴上围裙。
need
need作情态动词时，表示“需要”，多用于否定句和疑问句, 无人称、单复数和时态的变化。
We needn’t hurry because there’s enough time.
Need we finish our homework at once
实战演练
1. —Must I hand in the book report today, Miss White？
—No, you ______. Take your time. Just tomorrow.
A. shouldn't B. needn't C. mustn't D. can't
Must
2.—______ you give me a hand I can’t move the box by myself.
—No Problem.
A. Could B. Need C. Should D. May
3. —Is that boy Scott
—No, it___________ be Scott. Scott is much taller.
A. shouldn't B. mustn't C. can’t D. wouldn’t
实战演练
4. —May I take this magazine out of the reading room
—No, you ______. Please read it here.
A. may not B. needn't C. will not D. can't
5. How confident she looks! She ______ be ready for the competition.
A. must B. might C. could D. must
6. —Some people don't show their talents at the very beginning.
—I agree. Even Einstein ____________ read until he was seven.
A. can't B. mustn't C. couldn't D. needn't
实战演练
7. —What will the weather be like tomorrow
—It ________ be rainy, cloudy or sunny. I’m not sure.
A. must B. should C. can’t D. might
8. He ________ stay at home because of the heavy rain.
A. may B. have to C. has to D. must
大家来找茬
1. My brother can play the piano when he was six years old.
2. You needn’t to come to the meeting if you are busy.
3. Cindy have to look after her little sister at home.
4. Do you would like to come to my party
5. Mike said he will help me with my English.
was
could
needn’t
Cindy
has
would
Would you
said
would help
The camel can go without water for a long time. Some people think it may store water in its hump. This is not true. It stores food in its hump. The camel’s body changes the food into fat. Then it stores the fat in its hump. Fat all over an animal’s body keeps the animal warm. Camels live in the desert. They don’t have to be warm during the day.
The desert is very hot. The camel gets hotter and hotter during the day. It stores this heat in its body because the nights are cool. The Arabian camel has one hump. There must be a lot of sand in the desert. The camel has long eyelashes. Then the sand can’t go into the camel's eyes.
表能力
表推测
表客观必要性
表肯定推测
表能力
情态动词
基本特征
常用情态动词的
基本用法
can/could
may/might
must/have to
will/would
should/need