Modals are the auxiliaries that are used to convey special idea.

Modal Verbs

Function/Idea conveyed

Can Ability, Permission(informal)
Could Past of ‘Can’
May Possibility, Permission(Formal)
Might Past of ‘May’
Will &Shall  To express future time, to express determination, promise and threatening, to make requests
Should, Ought to Moral obligation, to express advice
Must, have to Social obligation( compulsion),duty, necessity
Used to Past habit

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