YOU SAID:
you can't kill two birds with one stone
INTO JAPANESE
あなたは一石二鳥
BACK INTO ENGLISH
You are one stone two birds
INTO JAPANESE
あなたは一石二鳥です
BACK INTO ENGLISH
You are two birds
INTO JAPANESE
あなたは二羽の鳥です
BACK INTO ENGLISH
You are two birds
That didn't even make that much sense in English.