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Agree with the conclusions using must,can't and might.
1) I'm sure he's a journalist.
2)he certainly isn't a doctor.
3)Perhaps he's working late.
4)I'm certain she doesn't have a job.
5)I m sure she's able to drive.
6)I'm certain she isn't in the office at the moment.
7)He's possibly a farmer.
8)I'm certain she's reliable