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|Noun||1.||imperfect tense - a tense of verbs used in describing action that is on-going|
tense - a grammatical category of verbs used to express distinctions of time
present progressive, present progressive tense - a tense used to express action that is on-going at the time of utterance
past progressive, past progressive tense - a progressive tense used to describe on-going action in the past; "`I had been running' is an example of the past progressive"