The music will be played softly when it is our turn to enter the ring Determine the case and function of the underlined pronoun.

possessive; direct object

nominative; subject

objective; indirect object

possessive; adjective

The pronoun here is "our" in "our turn" ("it is our turn to enter the ring") - I see no other pronoun here.

This pronoun is a possessive pronoun ("our" is a possessive pronoun in general) and its function is to function as an adjective - it describes "turn")