YOU SAID:

i had a cow who ate a pan on a fork

INTO JAPANESE

フォークでフライパンを食べた牛がいました

BACK INTO ENGLISH

There was a cow that ate a frying pan with a fork

INTO JAPANESE

フライパンをフォークで食べる牛がいました

BACK INTO ENGLISH

There was a cow eating a frying pan with a fork

INTO JAPANESE

フォークでフライパンを食べている牛がいました

BACK INTO ENGLISH

There was a cow eating a frying pan with a fork