YOU SAID:

never have I ever sang karaoke in front of a nun

INTO JAPANESE

私は修道女の前でカラオケを歌ったことがない

BACK INTO ENGLISH

I have never sung karaoke in front of a nun.

INTO JAPANESE

私は修道女の前でカラオケを歌ったことがありません。

BACK INTO ENGLISH

I have never sung karaoke in front of a nun.