This is the 10th most frequent Ukrainian word.
він
"He" or "it" (masculine).
The pronoun 'він' is used here as a subject pronoun to refer to a singular masculine entity performing an action.
Він читає книгу.
He is reading a book.
In this sentence, 'він' acts as the subject of a subordinate clause, providing additional information in the past tense.
Це обличчя він бачив раніше.
This face he has seen before.
Here, 'він' refers to the subject of the reported speech, conveying the necessity of an action.