YOU SAID:

i think my cat is on fire

INTO JAPANESE

私の猫は火がついていると思う

BACK INTO ENGLISH

I think that my cat is on fire

INTO JAPANESE

私の猫は燃えていると思います

BACK INTO ENGLISH

I think my cat is burning

INTO JAPANESE

私の猫は燃えていると思います

BACK INTO ENGLISH

I think my cat is burning