These pronouns are used when making statements or asking questions about identity or ownership.
subject = who
Who is he?
Do you know who he is?
object = whom
Is this the person with whom you spoke?
A: To whom did you speak?
B: I spoke to Anna.
whom = Anna
Anna
possessive adjective = whose
A: Whose skateboard is this?
B: It’s Spencer’s skateboard.
Spencer is the owner of the skateboard.
Spencer
possessive pronoun = whose
A: Whose is this?
B: I don’t know.
A: Whose are these?
B: They’re John’s.
this = singular (1)
these = plural (2+)
reflexive pronoun = /
There is not a reflexive pronoun that can be used with "who."
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There are a few important things to consider when using these pronouns:
Many Americans choose not to use "whom" unless the situation requires it. "Whom" sounds very formal. While it’s not grammatically correct to use "who" instead of "whom" when the pronoun should be in the objective case, most Americans do it anyway
Don’t confuse the contraction "who’s" (who is) with "whose." This is generally a spelling issue because both words sound the same.