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(共15张PPT)
Unit 4 Helping out
Grammar
Learning Objectives
In this lesson, you will:
1. understand the meaning and summarize the grammar rules of the
modal verbs may/might, can/could and must.
2. practice using "may, can, must" correctly to complete sentences
and dialogues in daily contexts.
3. apply the modal verbs to communicate appropriately in different
situations.
Lead in
Read the sentences from the reading passage and summarise the grammar rules.
(a) Well, crayons may carry viruses and spread diseases.
(b) It can be boring to wait for X-rays and treatments.
(c) There must be something for me to do.
(a) May is used to express a possible situation.
(b) Can is used to express possibility, or a common situation.
(c) Must is used to express a strong certainty, necessity, or
obligation.
情态动词（2）
may / might
当我们想表达可能发生某事以及某人可能做某事时，可以用may / might表示。例如:
Bring a map because you may want to travel around.
带张地图，因为你可能想四处转转。
There may be a few showers, so bring an umbrella with you.
可能会有阵雨，所以随身带把伞吧。
might与may没有太大的区别，形式上might是may的过去式，但在表示现在或将来的可能情况时，might表示的可能性比may表示的可能性要小一些。例如:
Take your swimming clothes because you might want to go
swimming in the sea.
带上游泳衣吧，说不定你想到海里游泳呢。
can / could
情态动词can和could除了表示“能够，可以”等意义之外，还可以表示对现在或将来的推测，意为“会，可能”。
但can表示推测时，往往用于否定句和疑问句。用于疑问句时，can比could表示的可能性要大; 用于否定句时，cannot (can't)表示“不可能”。例如:
You can't be serious!
你不是认真的吧!
could则可用于肯定句、否定句和疑问句。在以下例句中，can和could均表示可能:
He could be in pain. 他可能很疼。
That could be harmful! 那可能有害!
Can / Could this be true 这有可能是真的吗
must
情态动词must也可以表示猜测，意为“一定，肯定”，通常只用于肯定句。例如:
Betty, you must know! Betty，你肯定知道!
请仔细对比下面一组句子:
— Who sent the present Can it be your brother
是谁送来的礼物啊 会是你哥哥吗 (询问可能性)
— It must be your brother. I saw him in your room just now.
肯定是你哥哥，我刚才看见他在你的房间里。(语气强烈，表示非常肯定)
— It can't be my brother. He is still in France.
不可能是我哥哥，他还在法国呢。(表示不可能)
Complete the sentences with must, may or can.
1. You ______ be thirsty now after the long run. Here is a
bottle of water for you.
2. You didn't bring an umbrella Take mine. It______ rain later.
3. Here is my notebook. You ______ return it after the exam.
must
may
can
Look at the pictures and complete the dialogues with the correct form of the modal verbs.
must
may
can
can’t
can
Work in pairs. Discuss things to do to help people around you. Use the words and expressions from the reading passage and the Useful expressions to help you.
Useful expressions
... may find it a challenge to....
... help... get through...
... need a helping hand.
There must be something for me to do, such as...
Perhaps I can / could...

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