How to say “who / which (formal)” in Greek

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ο οποίος o o-PEE-os

who / which (formal)

“Ο άνθρωπος ο οποίος μίλησε είναι γιατρός.”

The person who spoke is a doctor.

This word doesn't change form the way verbs, nouns, and adjectives do — what you see above is its only form.