YOU SAID:
why does this happen to we, he made a mistake
INTO JAPANESE
なぜこれが私たちに起こるのか、彼は間違いを犯した
BACK INTO ENGLISH
He made a mistake why this happens to us
INTO JAPANESE
彼は私たちにこれが起こる理由を間違えました
BACK INTO ENGLISH
He made a mistake for us why this happens
INTO JAPANESE
彼はこれがなぜ起こるのか私たちのためにミスを犯した
BACK INTO ENGLISH
He made a mistake for us why this happens
You've done this before, haven't you.