He must / can't be a rock star. I've never heard of him.
can't
He's always getting invitations to parties. He must / can't know a lot of people
must
It can't / must be raining already. The weather forecast said it would be sunny all day.
can't
Look at all the books he has. He must / can't really like reading.
must
That must / can't be your phone ringing. You always keep it on silent.
can't
Jackie must / can't have much free time. She has two jobs
can't
It may / can't be too late to catch the train. Let's check the schedule.
may
It must / can't be very expensive to live in this area. The houses are so big and modern.
must
It can't / must be his car. He told me he sold it last week.
can't
Go for a walk in this rain? You must / can't be serious!
can't
It may / must be difficult to find a taxi now. It's rush hour.
may
It can't / might be Lucy's handwriting. It's too neat for her
can't
That must/can't be John at the door. He said he would visit today.
must
He must / can't be very tired. He has been working late every night this week.
must
She may / can't be at the library. She often goes there to study after class.
may
She knows all of their songs. She must / can't be a big fan.
must