YOU SAID:

why did i do that at the park

INTO JAPANESE

なぜ私は公園でそれをしたのですか

BACK INTO ENGLISH

why did I do it in the park

INTO JAPANESE

なぜ公園でやったのか？

BACK INTO ENGLISH

Why did you do it in the park?

INTO JAPANESE

なぜ公園でそれをしたのですか。

BACK INTO ENGLISH

Why did you do it in the park?