Must, Might, Can't: How Sure Are You? worksheet

1. 1.
   Her car isn't here. She at work.a) must beb) can't be
2. 2.
   That Tom. Tom's in Australia this month.a) must beb) can't be
3. 3.
   I'm not sure where she is. She in the library.a) might beb) must be
4. 4.
   You've just eaten a huge meal. You hungry!a) mustn't beb) can't be
5. 5.
   Take a jacket. It cold later.a) could getb) must get

1. 1.
   He mustn't be at home. The lights are off.
2. 2.
   She must to be tired.
3. 3.
   It might rains later.

Write three sentences of your own that use this rule. You can use these phrases.

• must be
• can't be
• might be
• could be
• should be
• may well

1. 1.a) must be The evidence (her car is gone) makes it almost certain.
2. 2.b) can't be You're sure it isn't true: can't.
3. 3.a) might be You're not sure: might.
4. 4.b) can't be For certainty, the negative of must is can't.
5. 5.a) could get It's possible, not certain: could.

1. 1.He can't be at home. The lights are off. For certainty, the negative of must is can't.
2. 2.She must be tired. No to after modals.
3. 3.It might rain later. After a modal, use the base verb with no -s.

Answers will vary. Check that each sentence follows the rule on page 1, or paste them into Clarigram to have them checked.