YOU SAID:

Why did you do it to them

INTO JAPANESE

理由は彼らにそれを行う

BACK INTO ENGLISH

The reason they do it

INTO JAPANESE

彼らはそれを行う理由

BACK INTO ENGLISH

They got a reason to do it

INTO JAPANESE

彼らはそれを行う理由を持ってください。

BACK INTO ENGLISH

They have reason to do it.

INTO JAPANESE

彼らはそれを行う理由があります。

BACK INTO ENGLISH

They have reason to do it.