YOU SAID:

if i'm a cat then the world is ok

INTO JAPANESE

私が猫なら、世界は大丈夫です

BACK INTO ENGLISH

If I am a cat, the world will be fine

INTO JAPANESE

私が猫なら、世界は大丈夫でしょう

BACK INTO ENGLISH

If I were a cat, the world would be fine

INTO JAPANESE

私が猫だったら、世界は元気だろう

BACK INTO ENGLISH

If I were a cat, the world would be fine