Important Modal Verbs and their usage

May is used for permission, probability.


Must indicates obligation, firm necessity, logical conclusion, probability


Shall is used to show intention, supposition


Will can be used for wish, desire, future


Ought to indicates moral duty, insistent advice, strict recommendation

Need is to show necessity

Have to is used to show order, unwillingness

Would indicates polite request, habit of the past, wish

Should is used to show necessity, advice, blame, recommendation, regret

Used to shows repeated action in the past

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