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English definition of “imperfect”

imperfect

noun [S]     /ɪmˈpɜː.fekt/ US  /-ˈpɝː-/
the imperfect specialized in some languages , the form of a verb that is used for an action that has not been completed in the past, used, for example , to refer to an action that was happening when it was suddenly interrupted , or to describe an existing situation at the beginning of a story : In the sentence 'He was hit by a car as he was crossing the road ', the verb ' cross ' is in the imperfect.Verb forms, tenses and types of verbsGrammatical terms
(Definition of imperfect noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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