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Use "imperf" in a sentence
"Gothic _sprauto_, we have in Icelandic _spretta_, imperf. _spratt_,"
"In the present and the past it is used, but only when the action embraces a certain length of time, otherwise the simple form "I buy," "I sold" _ (imperf. indic.) _ must be used, as --"
"-- Conjugated, Indic. mood, pres. tense, he is punished; imperf. tense, he was punished; perf. tense, he has been punished; and so on."