YOU SAID:
someday I'll be living in a big old city
INTO JAPANESE
いつか私は大きな旧市街に住んでいるだろう
BACK INTO ENGLISH
Someday I will live in the big old town
INTO JAPANESE
いつか私は大きな旧市街に住む
BACK INTO ENGLISH
Someday I will live in the big old town
That didn't even make that much sense in English.