YOU SAID:

I would walk 500 miles

INTO JAPANESE

500 マイルを歩くだろう

BACK INTO ENGLISH

Would walk 500 miles

INTO JAPANESE

500 マイルウォークか

BACK INTO ENGLISH

500 mile walk?

INTO JAPANESE

500 マイル散歩?

BACK INTO ENGLISH

500-mile walk?

INTO JAPANESE

500 マイル散歩?

BACK INTO ENGLISH

500-mile walk?