YOU SAID:

why should I do the thing you told me to do

INTO JAPANESE

なぜあなたが私に言った事を行う必要があります。

BACK INTO ENGLISH

Is that why you told me to do.

INTO JAPANESE

だからこそ、あなたがやれ。

BACK INTO ENGLISH

That's why you do it.

INTO JAPANESE

それをするのさ

BACK INTO ENGLISH

That's why you have to do it.

INTO JAPANESE

それをするのさ

BACK INTO ENGLISH

That's why you have to do it.