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Grammar: Modal verbs of deduction.
Grammar Reference: Modal Verbs of Deduction.
We use ‘must’ when we feel sure that something is true or it's the only
realistic possibility. We use ‘might’, ‘may’ or ‘could’ to say that we think
something is possible but we're not sure. We use ‘can’t' when we feel sure
that something is not possible. Modal verbs are followed by an infinitive
without to:, it can be simple infinitive, continuous infinitive, or perfect
infinitive, depending on the time of the action.
Don't go disturb him, he must be sleeping.
He wears a uniform, he must be a worker.
Where is my bag? I must have left in in the shop.
He can't be a doctor, I don't believe him.
I didn't say anything wrong, I can't have hurt him.
Tom isn't at home, he may be at work.
Lisa may be talking to her mother, I can hear her voice.
