1. Choose the correct words. (Chọn từ đúng.)

may, might, could, can, must

Definitely

Experts think that animals must have feelings.

Possibly

Scientists think that elephants (1) must / may express sadness.

Animal emotions (2) could / must be an interesting topic to study.

Mice (3) can't / might be more intelligent than we thought.

Possibly not

We (4) might not / could understand everything yet.

Definitely not

They feel sure that the evidence (5) may not / can't be true.

2. Correct the mistakes in bold. Tick the sentence that is correct.

(Sửa lỗi in đậm. Đánh dấu vào câu đúng.)

This small creature is really strange. It mays be very rare. may be

1. We not might finish our project on whales today.

2. Those zoo animals don't move around much. They could feel bored.

3. Our cat has just eaten. It don't can be hungry again.

4. Studies suggests that dolphins must to be very intelligent.

5. They might learning more about these animals in the future.

3. Complete the replies with may, must, might not or can't and the verb in brackets.

(Hoàn thành câu trả lời bằng may, must, might not hoặc can't và động từ trong ngoặc.)

'Do you know what that animal is over there?'

'Well, it can't be (be) a horse. It's too small.'

1. 'Ollie seems stressed." 'I think he _____ (feel) worried about his driving test.'

2. 'Are you coming to the beach later?' 'I'm not sure. I _____  (come) if I'm tired.'

3. 'That study was very successful.' 'Yes. The scientists _____  (be) very pleased.'

4. 'Why is Marta excited?' 'I don't know. She _____ (have) tickets for that concert. She was trying to buy some online.'

5. 'Is it time to get up?' 'No, it's still dark outside. It _____  (be) morning yet.'

4. Rewrite the underlined sentences with might, might not, must or can't.

(Viết lại các câu được gạch chân bằng might, might not, must hoặc can't.)

Bradley looks relaxed. He definitely isn't nervous.

He can't be nervous.

1. That giraffe seems unhappy. It's possible that it feels sad.

_________________________________________________________

2. Ava called me. Perhaps she won't meet us later.

_________________________________________________________

3. That perfume is a luxury brand. I'm sure it's very expensive.

_________________________________________________________

4. The sky is grey. Maybe it will rain later.

_________________________________________________________

5. Look at the price label! I'm sure it doesn't cost that much.

_________________________________________________________

5. Write sentences about photos A and B. Use may, might, could, can't and must and the words in the box or your own ideas.

(Viết câu về các bức ảnh A và B. Sử dụng các từ may, might, could, can't và must và các từ trong khung hoặc ý tưởng của riêng bạn.)

Ví dụ: The woman might be surprised by the horse jumping up.

(Người phụ nữ có thể ngạc nhiên khi thấy con ngựa nhảy lên.)

She could be bored of studying.

(Cô ấy có thể chán học.)