If we have no list of choice, we say:

What thing do you know?

If the list of choice appears, for example "of these ones", we change "what" for "which":

Which thing of these ones do you know?

But what to do if we deal with alive nouns?

An example without the choice list:

What person do you know?

What if we add "of them". Does "what" have a variant for the choice of list for alive nouns like "which" for not alive ones or it would be "which' anyway?

Which person of them do you know?


Instead of “what person” or “which person” you can use “who” or “whom”:

Whom do you know?

Who of them do you know?

Who of the following people do you know?

  • "Which person of them do you know?" is incorrect? – Michael Azarenko Apr 2 '19 at 14:04
  • @MichaelAzarenko that sounds awkward to me, even if it might be technically grammatical. “Which person” is equivalent to “who” and “who” would be much more likely to be used in a question like this. – Mixolydian Apr 2 '19 at 14:11

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