Кто бы ни сделал ошибку, я не отвернусь.

Questions & Answers about Кто бы ни сделал ошибку, я не отвернусь.

Why does this sentence use the past tense сделал, especially since the second half is in the future tense (отвернусь)?
The construction кто бы ни (whoever / no matter who) requires the verb to be in the past tense, regardless of when the action actually happens. The particle бы always triggers the past tense form in Russian, creating a hypothetical or generalized meaning here rather than indicating a strict past action.
Why is the particle ни used here instead of не?
In this sentence, ни doesn't negate the verb. When combined with a question word like кто and the particle бы, ни acts as a particle that translates to "-ever" or "no matter". Together, кто бы ни means "whoever". If you used не, it would mean "who wouldn't make...", which completely changes the meaning into a negative statement.
If I am talking exclusively to or about women, should I change the verb to сделала?
No, you should still keep it as сделал. Grammatically, the pronoun кто strictly dictates the masculine singular form of the verb in the past tense, even if you are conceptually referring to a woman, multiple people, or a mixed group.
What does the prefix add to the meaning of отвернусь?
Отвернусь is the first-person singular future perfective of отвернуться (to turn away). It shares a root with other turning verbs (like вернуться, to return), but the prefix от- specifically adds the spatial meaning of moving, stepping, or turning away from an object or person.

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