Is it mandatory to say "It's Mary's turn now" or would it be possible to say "It's turn of Mary now" too?

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Use:
"It's Mary's turn now."
or "Mary's turn is next."
or "Mary's turn is now."

This one:
"It's the turn of Mary now."
Would be correct, no grammar problem, etc., but do not use it.
Nobody would actually say this. You would be understood, but it is not used.