Conjugation of the verb усомниться, 2nd conjugation, perfective aspect 
doubt
Изъявительное наклонение
настоящее время
-прошедшее время
будущее время
Сослагательное наклонение
Повелительное наклонение
(ты)(вы)
Причастия и деепричастия
причастие
Действительный залогдеепричастие
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