Thread:User talk:CodeCat/Perfective and imperfectie forms/reply (16)

What about semelfactive verbs - стукнуть, кинуть, сдохнуть, they are not formed using prefixes? There are too many prefixes and verbs differ in perfective/imperfective without adding anything - спрашивать/спросить, взвешивать, взвесить, they may not have a pair or have multiple opposite equivalents. Imperfective may be more common than perfective and vice versa, making them absolutely equal, so that one can't be really explained as "a form" of the other. They exist in pairs.

доде́лать, переде́лать, вы́делать, отде́лать, заде́лать - all add additional senses to делать, not just making them perfective forms but separate verbs, even if these in turn can have additional imperfective forms, e.g. доде́лывать.