He _______ be happy, he has just won the lotto!
must
She _______ be crazy! Unicorns don't exist.
must
That _______ be true. He always lies.
can't
He _______ be at the gym right now. He sometimes goes there at this time.
might (may, could)
A: Who's at the door? B: I don't know, it _______ be John.
might (may,could)
Sorry, but I'm not Connor. You _______ be confusing me for someone else.
must
He isn't very nice. He _______ have a lot of friends.
can't
She always gets good grades. She ______ be a good student.
must
