Breakdown of Мы недооценили этого конкурента, и он выиграл.
и
and
он
he / it (for a masculine noun) / it (for a neuter noun)
мы
we
этот
this [f: эта, n: это]
конкурент
the competitor (m)
выиграть
to win
недооценить
to underestimate
Questions & Answers about Мы недооценили этого конкурента, и он выиграл.
How does the prefix недо- work in the verb недооценили?
The prefix недо- indicates that an action was done insufficiently or below the required standard. By adding it to оценить (to evaluate or estimate), we get недооценить (to underestimate). To say you overestimated someone, you would use the prefix for excess, пере-, making переоценить.
Could I write не дооценили as separate words?
Not if you want to say 'underestimated'. The prefix недо- expressing deficit is always written as a single unit attached to the verb. If you wrote не дооценили with a space, it would literally mean 'did not finish evaluating' (the negative particle не plus a verb with the completion prefix до-), which completely changes the meaning.
Why do we use the forms этого конкурента (which look like genitive) instead of the nominative этот конкурент?
They are the direct object of the verb недооценили, so they must be in the accusative case. Because конкурент (competitor) is an animate noun (a living person), its masculine singular accusative endings match the genitive case endings, resulting in этого конкурента.
Why use the perfective verb выиграл here instead of the imperfective выигрывал?
The sentence focuses on a single, completed event with a final result: the competitor achieved the victory. The imperfective выигрывал would mean 'was winning' (a process in the past) or 'used to win' (a repeated habit), neither of which fits the finality of this specific outcome.
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