aspect?

[R. M. Cleminson]

The prefix до-, despite its meaning, does not automatically perfectivise a verbal root to which it is attached, because one can be in the process of completing something.  Thus there are many aspectual pairs with the prefix, such as додавать/додать, доделывать/доделать, etc., which correspond morphologically to other pairs formed from the same roots with other prefixes (отдавать/отдать, отделывать/отделать, etc.).  The prefix до- is also productive, which means that it can form verbal pairs that are not (yet) in the dictionary; дорешать/дорешить is one of those, and corresponds morphologically to отрешать/отрешить, предрешать/предрешить.  One must therefore conclude that дорешать is imperfective.
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