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