YOU SAID:

My dog ate my goldfish and then i bought a new goldfish

INTO JAPANESE

犬が金魚を食べて、新しい金魚を買いました

BACK INTO ENGLISH

The dog ate a goldfish and bought a new goldfish

INTO JAPANESE

犬は金魚を食べて新しい金魚を買いました

BACK INTO ENGLISH

The dog ate a goldfish and bought a new goldfish