Question

my sister sings a song convert to passive voice

Answer 1

ʜᴇʏᴀ ᴍᴀᴛᴇ ʜᴇʀᴇ ɪs ʏᴏᴜʀ ᴀɴsᴡᴇʀ 
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●A song is sung by my sister

Answer 2

HERE IS UR ANSWER:-

A SONG IS Sung BY MY SISTER.

HOPE IT HELPED U!✌✌