Modals of probability/possibility (Deduction)

Help

What modal verb do we use when we are SURE that something is true (even though we don't actually know)?

Must

What modal verb do we use when we are SURE that something ISN'T true (even though we don't actually know)?

can't

What modal verbs do we use when we are think something MIGHT be true (even though we don't actually know)? There are three.

might/may/could

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