YOU SAID:

I have done this before

INTO JAPANESE

前にこれを行っています。

BACK INTO ENGLISH

Has done this ago.

INTO JAPANESE

この前行っています。

BACK INTO ENGLISH

Before this is done.

INTO JAPANESE

前にこれが行われます。

BACK INTO ENGLISH

Ago this is done.

INTO JAPANESE

これは前に行われます。

BACK INTO ENGLISH

This is done ago.

INTO JAPANESE

これは前に行われます。

BACK INTO ENGLISH

This is done ago.