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'Kept' is modal verb used to express some action which is incomplete or ongoing from the past or to convey an action which is unceasing.
'Kept' is used sometime to delay someone, or to make someone wait.
'KEPT' is Past tense and past participle of 'keep'.
"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.