Unit 2 Healthy eating 情态动词

(共12张PPT)
Verbal verbs 情态动词
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1.can /could
1)----Can you play basketball
----Yes I can.
2) I can finish the work before 10 o’clock.
3) Amy could play the guitar at the age of 9.
can /could 表示能力，意为“能，会”，could为过去式。
4）----Can I use your computer
----Yes ,you can.
5)----Could I use your pen
---- Yes ,you can.(不用could)
表示请求和许可，意为“能够，可以”，could表示语气更委婉
6）The story cannot be true.
7）She cannot make mistake.
8）She cannot have gone to school.We have no school today.
9) ----There is the doorbell.
----Who can it be
表示推测，意为“可能”，用于疑问句或者否定句中
may/might
1） You may take the book out .
2) ----May/ Might I have a word with you
----Yes, you may.
表示许可和征询对方许可，意为“可以”
3) He may/might be in the classroom.
4) He may be late. Worse still, he may not come at all .
5) He may/might have known the news.
表示推测，意为“可能，或许”，表示把握不太大的推测。
6）May you have a happy life.
7) May you succeed.
用于祈使句中，表示“祝愿”。
will/would
1)Will /Would you pass me the book
2) Will you change your plan
表示请求和建议。
3)----Will you change your plan
----Yes, I will.
4）I will do anything except cook.
5）I will never do that again.
表示意愿，愿望和决心。
6) Water will boil at 100℃.
7) On Sunday he would go to the park to play chess.
表示某种倾向或者习惯性动作。
shall
1) Shall I/We/He/She/They leave now
2) Shall I turn on the lights
3) Shall he wait for you outside
在疑问句中用于第一、三人称表示说话人征求对方的意见或者向对方请求。
4）When he comes in, nobody shall say a word.
5)You shall fail if you don’t work hark.
6)You shall have a nice present for your birthday.
7）You shall suffer for this.
用于第二、三人称，表示说话人给对方的命令、警告、允诺和威胁。
should
You should go to class right away.
You should work harder.
You should help your mother with the housework.
表示劝告、建议或命令。意为“应该”
4）He should arrive soon.
5) I think he should be there by now.
表示按照常理的推测。意为“可能，按道理应该”
6)It’s strange that he should be late.
7)----what time does the film start
---- How should I know
8) ----Could your wife help us clean the office tomorrow
----Why should she help She doesn’t work for you.
表示说话人的特殊的情感，如意外、愤怒、不满。
must
1)You must study hard .
2) You must come to school before 7 o’clock every morning.
3）You mustn’t do that again.
表示“必须”,mustn’t 表示“禁止，不准”。
4) You must be tired after such a long walk.
5) He must have gone to school today.
表示肯定的推测，意为“一定”