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'Keep' is modal verb used to hold, or retain something and to express continued (ongoing) action or to do something repeatedly.
We use the verb keep with the present participle to emphasize the ongoing action persists / persisted or should persist.
'KEEP' is an Auxiliary verb as well as main verb and used to express continued action.
"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.