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1. Fill in the gaps with a suitable modal verb. a. She always gets great marks; She _________ very intelligent. b. She always gets great marks; She _________ be stupid. c. Their car is really old; they _________ have a lot of money. d. Jane usually goes out in the evening, so she _________ be at home when we get there. e. Ian isn´t here, so he _________ be at school, but I’m not sure. f. I don’t believe it. She looks really well, so she _________ be sick. g. You haven’t eaten all day. You _________ be hungry! h. He _________ be tired. He hasn’t done anything all day! i. Tess _________ lend you some money. Why don’t you ask her? j. Don’t go in. The dog _________ bite you. k. I can’t promise to help you because I _________ have time. l. He eats a lot of junk food and he never exercises, so he _________ be very healthy. m. Lisa never eats very much, so she _________ want to go to the restaurant for lunch. Let’s ask her. n. Wendy is so rude; she _________ have many friends. o. Tim told me not to wait for him because he _________ arrive in time.

Modal Verbs Ability Certainty and Probability

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Worksheet on modal verbs

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Page 1: Modal Verbs Ability Certainty and Probability

1. Fill in the gaps with a suitable modal verb.

a. She always gets great marks; She _________ very intelligent.

b. She always gets great marks; She _________ be stupid.

c. Their car is really old; they _________ have a lot of money.

d. Jane usually goes out in the evening, so she _________ be at home when we get

there.

e. Ian isn´t here, so he _________ be at school, but I’m not sure.

f. I don’t believe it. She looks really well, so she _________ be sick.

g. You haven’t eaten all day. You _________ be hungry!

h. He _________ be tired. He hasn’t done anything all day!

i. Tess _________ lend you some money. Why don’t you ask her?

j. Don’t go in. The dog _________ bite you.

k. I can’t promise to help you because I _________ have time.

l. He eats a lot of junk food and he never exercises, so he _________ be very

healthy.

m. Lisa never eats very much, so she _________ want to go to the restaurant for lunch.

Let’s ask her.

n. Wendy is so rude; she _________ have many friends.

o. Tim told me not to wait for him because he _________ arrive in time.

Page 2: Modal Verbs Ability Certainty and Probability

2. Rewrite the sentences using a modal verb.

a. I’m sure he is a basketball player. He

________________________________________

b. Perhaps he is a basketball player. He

________________________________________

c. Perhaps he isn’t a basketball player. He

______________________________________

d. I’m sure he isn’t a basketball player. He

______________________________________

e. I’m sure she has got a Porsche. She

__________________________________________

f. Perhaps she has got a Porsche. She

__________________________________________

g. Perhaps she hasn’t got a Porsche. She

________________________________________

h. I’m sure she hasn’t got a Porsche. She

________________________________________

3. Fill in the gaps with the correct form of can.

a. ___________ you read when you were five years old? No, I ___________.

b. Doris is from Austria so she ___________ speak German, but she ___________

speak French.

c. They ___________ drive, but they want to learn.

Page 3: Modal Verbs Ability Certainty and Probability

d. Sarah ___________ ride a motorbike when she was twelve, and now she

___________ also fly her father’s airplane.

e. My son ___________ speak until he was three years old.

f. I ___________ dance before, but now I ___________. I’m too old.

g. Her eyes are really week. She ___________ read the headlines, but she

___________ read the small print.

4. Write questions for the answers.

a. _____________________________________________________________________?

No, I can´t play the violin, but I can play the guitar.

b. _____________________________________________________________________?

Yes, she can cook very well.

c. _____________________________________________________________________?

No, he couldn’t play chess when he was younger.

d. _____________________________________________________________________?

No, I couldn’t speak English very well when I was small.

e. _____________________________________________________________________?

Yes, I could swim when I was little.

f. _____________________________________________________________________?

Yes, they can ride a motorbike.

Page 4: Modal Verbs Ability Certainty and Probability

Answer key

1

a. must b. can’t c. can’t d. might not / may not e. might / may/ could f. can´t g. must h. can’t i. might / may j. might / may / could k. might not / may not l. can’t m. might not / may not n. can’t o. might not / may not

2.

a. must be a basketball player. b. might be a football player. c. might not / may not be a basketball player. d. Can be a basketball player.

a. must have a Porsche. b. may / might have a Porsche. c. might not / may not have a Porsche.. d. can’t have a Porsche.

3.

a. Could / couldn’t b. can / can’t c. can´t d. could / can e. couldn’t f. could / can’t g. can / can’t

4.

a. Can you play the violin? b. Can she cook well? c. Could he play chess when he was younger?

Page 5: Modal Verbs Ability Certainty and Probability

d. Could you speak English when you were small? e. Could you swim when you were little? f. Can they ride a motorbike?