Grammar Exercises

Modals of Deduction: Must or Can’t?

MODALS of DEDUCTION

Certainty in the present – Must or Can’t?

Rephrase these sentences using ‘can’t’ or ‘must’. Scroll down for the answers.

I’m convinced Nick likes you as he’s always looking at you.  ➡️   Nick must like you as he’s always looking at you.

1.  I’m certain they aren’t at home as there are no lights on.

2.  It’s impossible you are tired as you slept for ten hours!

3.  I’m sure Jack knows Leo as I saw them talking the other day.

4.  It’s definitely not their dog as their dog has a black tail.

5.  I bet Australia is a wonderful place to visit.

6.  Everyone is certainly in the garden because there’s nobody in the house.

7.  I really doubt he is our pilot. He’s far too young!

8. Alex spends a lot of time playing chess for sure because he is incredibly good.
















Answers

1. They can’t be at home as there are no lights on.
2. You can’t be tired as you slept for ten hours!
3. Jack must know Leo as I saw them talking the other day.
4. It can’t be their dog as their dog has a black tail.
5. Australia must be a wonderful place to visit.
6. Everyone must be in the garden because there’s nobody in the house.
7.  He can’t be our pilot. He’s far too young!
8. Alex must spend a lot of time playing chess because he is incredibly good.

There are lots more free resources for self-study and the classroom here on my website, including…

Past simple  Exercise 1 Exercise 2

Present simple or present continuous? Exercise 1

Present perfect continuous Exercise 1

Present perfect simple vs present perfect continuous Exercise 1

TEST YOUR IDIOMS!

Parts of the Body Exercise 1

Animals  Exercise 1

Idioms with ‘Give’  Exercise 1

Idioms with ‘Make’  Exercise 1  Exercise 2

Idioms with ‘Take’  Exercise 1

Idioms with ‘Keep’  Exercise 1

Idioms with ‘Think’  Exercise 1

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