who

(interrogative, nominative, plural, singular)What person or people; which person or people; asks for the identity of someone; used in a direct or indirect question.

You're getting married‽ Who to? (direct question)

I don't know who it is. (indirect question)

wer

ктоkto

хтоxto

Introduces a relative clause having a human antecedent.

(nominative, plural, relative, singular)With antecedent as subject.

That's the man who works at the newsagent. (defining)

My sister, who works in the accounts department, just got promoted to manager. (non-defining)

der, die, das

чтоšto, кото́рыйkotóryj, кото́раяkotóraja

хтоxto, щоščo, ко́трийkótryj

(nominative, plural, relative, singular)With antecedent as object: whom.

That's the man who I saw earlier.

My brother, who you met the other day, is coming to stay for the weekend.

(nominative, plural, singular)Whoever, he who, they who.

Who dares wins.

Who insults my mother insults me.

(informal, nominative, plural, singular)Also used with names of collective nouns that are groups of people, especially singularly-named musical groups or sports teams.

Who are the Miami Heat?