Modal Verb - Using CAN'T and MUST

Section A : Modals of probability and deduction - Using CAN and MUST

Fill in the gaps with the right modal of deduction. Use CAN'T or MUST.

1. You've been working all night long. You...........be tired.

2. That doctor.........be pretty famous in the town. Everyone knows him.

3. That restaurant .......... be very good. It is always empty.

4. The weather was stormy everyday during their holiday, so they ........ have had a very nice
holiday.

5. Despite his wife's illness, the baby was delivered safely. The couple ...... be very happy and
relieved.

6. You got here very quickly. You ..... have taken a taxi.

7. Tim and Lucy go away on holiday very often, so they .... have a lot of savings in their account.

the answer: 1. must ; 2.must; 3.can't; 4.can't; 5.must; 6.must; 7.can't and must.

Section B: Modals of deduction - Using CAN"T HAVE, MUST HAVE

Choose the best answer to explain these given situations.
1. The coat you bought is of very good quality.
a) It must have been very expensive.
b) It can't have been very expensive.

2. My friend Christine walked past me without speaking.
a) She must have seen me.
b) She can't have been very expensive.

3. The phone rang but I didn't hear it.
a) I must have been asleep.
b) I can't have gone away.

4. I haven't seen our neighbors for ages.
a) They must have gone asleep
b) They can't have gone away

5. I can't find my mobile phone.
a) I can't have left it in the restaurant we had dinner at last evening.
b) I must have left in the restaurant we had dinner at last evening.

6. Dan passed his exams with excellent grades, despite not having prepared for it.
a) The exam must have been very difficult.
b) The exam can't have been very difficult.

7. The police knew every detail of their phone conversation.
a) They can't have done some wiretapping.
b) They must have done some wiretapping.


the answer : 1.a ; 2.b; 3.a; 4.a; 5.b; 6.b; 7.b.

make a conversation use can't or must
for example
D: Hi Julie, how are you today?
J: Hi Dewi, I'm good, thanks .
D: Julie..your car is very good make.
J: Thanks, my friend give me.
D:wow. really ? congratulation.. your friend must be a rich man.
J: I think so.

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