YOU SAID:

the cat I live with is the most egotistical person I've ever seen and it is 4 months old

INTO JAPANESE

私が住んでいる猫は私が今まで見た中で最もエゴチックな人で、4ヶ月です

BACK INTO ENGLISH

The cat I live in is the most eggic person I have ever seen and it is four months

INTO JAPANESE

私が住んでいる猫は、私が今まで見た中で最も熱心な人で、4ヶ月です

BACK INTO ENGLISH

The cat I live in is the most enthusiastic person I have ever seen, four months

INTO JAPANESE

私が住んでいる猫は私が今まで見た中で最も熱心な人、4ヶ月です

BACK INTO ENGLISH

The cat I live in is the most enthusiastic person I have ever seen, four months