Important Modal Verbs and their usage
May is used for permission, probability.
May
Must indicates obligation, firm necessity, logical conclusion, probability
Must
Shall is used to show intention, supposition
Shall
Will can be used for wish, desire, future
Will
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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