Conjugation of the verb учетверить, 2nd conjugation, perfective aspect 
quadruple
See also:
учетверять,
imperfective aspect
Изъявительное наклонение
настоящее время
-прошедшее время
будущее время
Сослагательное наклонение
Повелительное наклонение
(ты)(вы)
Причастия и деепричастия
причастие
Действительный залогСтрадательный залог
деепричастие
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