Deductions

Lily has studied french since she was a child. She (must/can't) speak very well.

Louise is always going to concerts. She (must/can't) love music.

We've just had breakfast. You (must/can't) be hungry.

Isabella is not 18 years old yet. She (must/can't) get married now.

Paul has been teacher for 30 years. He (must/can't) be afraid of speaking in public.

Susan has danced for two hours. She (must/can't) be tired.