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(共18张PPT)
Unit 4
Helping out
Grammar
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.
Fill in the blanks according to Leah's story.
1. Crayons may ____________ and ______________, so they can only be used once.
2. It can be boring to __________ X-rays and treatments in the hospital.
3. Leah must __________ other young patients a lot.
4. Could Leah __________________ for 500 boxes of crayons
5. It might ________________, but Leah did it.
carry viruses
spread diseases
wait for
care about
raise enough money
sound impossible
这些情态动词分别表示什么？
may/might表示可能
can/could/must表示推测
(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.
5
Read the sentences from the reading passage and summarise the grammar rules.
can/must表示推测
may表示可能
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。
情态动词一般无人称和数的变化，后需接动词原形。
might 与 may 没有太大的区别，形式上 might 是 may 的过去式，但在表示将来的可能情况时，两者都可使用，且might 表示的可能性比 may 表示的可能性要小。
We may/might not visit the city.
情态动词否定式是在动词后面加not。
can / could
can 和 could 表示对现在或将来的推测，意为 “会，可能”。can表示推测时，往往用于否定句和疑问句。could则可用于肯定句、否定句和疑问句。
① Jack could be in pain.
② Can/Could this be true
③ It can't be Dad. He won't be back now.
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”。
must表示推测
① You must be tired after such a long journey.
② My mother must be watering the flowers in the garden now.
情态动词 must 表示有把握的猜测，意为“一定，准是”，通常只用于肯定句。
经过这么长的路程，你想必累了。
我妈妈现在一定在花园里浇花。
否定形式 must not (mustn't) 表示“不能”或“禁止”的意思，不表示推测。
Complete the sentences with must, may or can.
6
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.
Dialogue 1
A: Look at that man! It ______ be hard for him to carry all the boxes!
B: Let’s give him a hand.
Dialogue 2
A: That woman looks lost. She _________ need help.
B: Yes. We _________ go and ask her.
must
may/might
can/could
Dialogue 3
A: Is that Lily over there
B: It ______ be her. She has the flu and has to stay at home.
A: That’s too bad. The lesson today is really important.
B: Don’t worry. We __________ share our notes with her.
can’t
could
Let’s role-play.
Create a dialogue and role-play. Remember to use correct modal verbs.
A: Our community needs volunteers. How about signing up
B: Good idea! What can we do to help
A: We could clean the streets to make the community tidier. We may also help the elderly cross the road safely.
B: Sounds great! The community must become tidier! And the elderly may feel cared for, too!
Sample
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...
A helping hand
Who needs your help
What can you do to help
Why do they need help
Lin Peng needs our help.
He finds it a challenge to prepare the English presentation and may feel nervous about it.
We can help him find some presentation material. We can also help him practise public speaking.
Student 1: Do you have time after school today
Student 2: Yes, I do. What's up
Student 1: Well, it's about Lin Peng. He needs some help with his homework.
Student 2: What's the matter
Student 1: He finds it a challenge to prepare the English presentation. He may also feel nervous about it. Perhaps we could help him find some material.
Student 2: No problem. And we can also help him practise public speaking.
Student 1: OK, then. I'll let him know. He must feel happy with our help.
Must do:
Choose a dialogue from Exercise 7 and add more sentences using must/may/can.
Choose to do:
Ask your friends "What do you think you might need help with this week " and write their answers using must/may/can.
Homework

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