YOU SAID:

Did I do something that you never done before?

INTO JAPANESE

私何かをする前にやったか。

BACK INTO ENGLISH

I did before you do anything.

INTO JAPANESE

私はあなたが何かをする前にやった。

BACK INTO ENGLISH

I did it before you did anything.

INTO JAPANESE

あなたが何かをする前に私はそれをしました。

BACK INTO ENGLISH

I did it before you did anything.