Fill in a suitable modal verb: must, can, may, might.

1. I'm sure he's a nice man.
   He ... be a nice man.

   
   
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2. I'm sure that isn't Betty - she's in France.
   That ... be Betty.

   
   
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3. I doubt that Peter will come to the party; he's got a lot of work to do.
   Peter ... come to the party.

   
   
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4. Ellen won't help you.
   Ellen ... help you, but I don't think she will.

   
   
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5. It's possible it will rain tomorrow.
   It ... rain tomorrow.

   
   
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6. Ann has been in bed all day.
   She ... be ill.

   
   
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7. If A is bigger than B, and B is bigger than C, then A ... be bigger than C.

   
   
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8. I'm sure you're not serious.
   You ... be joking.

   
   
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9. Peter didn't take that money - I'm sure of it!
   Peter ... be the thief.

   
   
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10. I'm sure he's not a teacher - he's too impatient.
    He ... be a teacher.

    
    
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