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Imperfective only

These verbs are followed ONLY by the imperfective aspect

to begin начинать, начать
to start стать
to undertake, begin приниматься, приняться
to continue продолжать, продолжить
to finish кончать, кончить
to give up бросать, бросить
to stop переставать, перестать
to cease прекращать, прекратить
to teach someone учить
to teach oneself научиться
to talk out of отговаривать, отговорить
to get used to привыкать, привыкнуть
to get out of the habit of something отвыкать, отвыкнуть
to decide not to, change one's mind раздумать
to get tired of устать
it's not necessary, recommended не надо, не нужно
there's no reason незачем
it's not necessary, mandatory не следует
it's not worth не стоит
it doesn't make any sense не имеет смысла
enough хватит, довольно
it's sufficient, suffice it to say достаточно
it's useless бесполезно (infinitive only)
it's harmful вредно (infinitive only)
to be sick and tired of надоело