YOU SAID:

Why does my friend do that?

INTO JAPANESE

私の友人はなぜそれを行うのですか。

BACK INTO ENGLISH

My friend do it why?

INTO JAPANESE

私の友人は、なぜそれを行う?

BACK INTO ENGLISH

My friend, why do it?

INTO JAPANESE

私の友人、それはなぜですか?

BACK INTO ENGLISH

My friend, why is it?

INTO JAPANESE

私の友人、それはなぜですか?

BACK INTO ENGLISH

My friend, why is it?