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I.Agree with the coclusions using must , can't and might.
a).I'm sure he's a journalist.
b) He certainly isn't a doctor.
c)Perhaps he's working late.
d)I'm certain she doesn't have a job.
e) I'm sure she's able to drive.
f) He's possibly a farmer.
g) I'm certain she's reliable
ex: Yes , he must be a journalist.