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