YOU SAID:

I think that that that that that boy used was wrong.

INTO JAPANESE

あの少年が使っていたのは間違っていたと思います。

BACK INTO ENGLISH

I think it was wrong for that boy to use it.

INTO JAPANESE

あの少年がそれを使うのは間違っていたと思います。

BACK INTO ENGLISH

I think it was wrong for that boy to use it.