YOU SAID:

I would walk 500 miles and I would walk 500 more.

INTO JAPANESE

私は500マイル歩くと私は500をもっと歩くだろう。

BACK INTO ENGLISH

As I walk 500 miles, I will walk 500 more.

INTO JAPANESE

私が500マイル歩くと、私は500をもっと歩くでしょう。

BACK INTO ENGLISH

As I walk 500 miles, I will walk 500 more.