YOU SAID:

You've done this before,

INTO JAPANESE

前にこれをやった

BACK INTO ENGLISH

Done this ago

INTO JAPANESE

この前行ってください。

BACK INTO ENGLISH

Do this before.

INTO JAPANESE

前にこれを行います。

BACK INTO ENGLISH

Prior to this.

INTO JAPANESE

前にこの。

BACK INTO ENGLISH

Prior to this.