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"May" is a modal verb most commonly used to express possibility and wish. It can also be used to give or request permission."
'May' applies to situations that are possible or could be possible.
It is used to ask permission/approval, to make a request/refusal, to indicate possibility and to express wish.
"Auxiliary-cum-verbs" are :
These 11 auxiliaries are also used as verbs, therefore, they are called Auxiliary–cum–verbs.
These are used to form Tenses. ( Please refer Tense Table).
"Pure Auxiliary verbs" are :
These 20 auxiliaries only support normal verbs, therefore, they are called Pure Auxiliary Verbs. They are also called Models or Model Auxiliary Verbs.