Did you hear me come in last night? No, I (be) -----asleep.
must have been
I'm sure she is at home today.
She must be at home today.
Perhaps he left the car unlocked.
He might have left the car unlocked.
I'm sure you forgot doing your homework.
You can't have forgotten doing your homework.
Emily is crying. She --------------- be sad.
must
I'm sure they aren't at work today.
They can't be at work today.
It is possible that you forgot your wallet at home.
You might have left your wallet at home.
I’m certain that she is a doctor.
She must be a doctor.
I'm sure Jane isn't late today.
Jane can't be late today.
Perhaps he was at home yesterday.
He might have been at home.
I'm sure that Susan is not the thief.
Susan can't be the thief.
Kate is shivering. She ------------- be cold.
must
I'm sure Jane is sleeping now.
Jane must be sleeping.
Perhaps he is working today.
He may be working today.
I'm sure the cat is in the house somewhere.
The cat must be at home.
I had an umbrella when I came out but I haven't got it now.You (leave) ------------- it on the bus.
might have left
John will probably come to the party. John
John may come to the party.
It is impossible that he is Spanish.
He can't be Spanish.