YOU SAID:

Why would you do this?

INTO JAPANESE

あなたはなぜこれをするか。

BACK INTO ENGLISH

Why you do this?

INTO JAPANESE

なぜあなたはこれを行う?

BACK INTO ENGLISH

Why are you doing this?

INTO JAPANESE

どうしてこうしているんですか。

BACK INTO ENGLISH

Why you are doing it?

INTO JAPANESE

あなたはそれをやっている理由?

BACK INTO ENGLISH

Is your reason for doing it?

INTO JAPANESE

それを行うためのあなたの理由ですか。

BACK INTO ENGLISH

What is your reason for doing it.

INTO JAPANESE

それを行うためのあなたの理由は何です。

BACK INTO ENGLISH

What is your reason for doing it.