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"As a modal auxiliary verb 'Can' is most often used to express when a person or thing is physically, mentally, or functionally able to do something."
'Can' is used to express or ask for permission, to describe the possibility, express ability, issue requests, orders or suggestions and making offers.
As a modal auxiliary verb, can is most often used to express a person or thing’s ability to do something. It is also used toexpress or ask for permission to do something, to describe the possibility that something can happen, and to issue requests and offers.
It is used only in the present tense. It goes with all (3) persons. ie. (First , Second and Third person).
"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.