must, modal verb that expresses obligation by the speaker, certainty, Are used to give deductions or assumptions, speculation, are used when we want to guess something, Obligation, have to and must are modal verbs of, may, shows possibility in the present or the future., Mustn’t, is used to express prohibition, Could, Something is possible in the present or future., have to, normally means that the obligation is external., Might, Possibility in the present or future., infinitive, form of the verb to deduce and speculate in the present, Possibility, May/Might/Could/Must are modal verbs of, participle, is the form of the past verb to speculate in the past, can, used to ask and give permission, can't, to talk about something that is against the rules, particularly when we didn't make the rules, permission, can/could/may are examples of the modal verbs of

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