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