YOU SAID:
Never have i ever killed two birds with one stone.
INTO JAPANESE
私は今までに一石二鳥の鳥を殺したことがない。
BACK INTO ENGLISH
I have never killed one stone and two birds.
INTO JAPANESE
私は一石と二羽の鳥を殺したことがない。
BACK INTO ENGLISH
I have never killed one stone and two birds.
You've done this before, haven't you.