YOU SAID:

whenever the cat sees a mouse, he eats it in the house

INTO JAPANESE

彼が家でそれを食べる猫は、マウスを見るたびに

BACK INTO ENGLISH

Whenever he eats it in a House cat's mouse

INTO JAPANESE

彼は家猫のマウスでそれを食べるたびに

BACK INTO ENGLISH

Whenever he eats it with a House cat mouse

INTO JAPANESE

彼は家猫のマウスを使ってそれを食べるたびに

BACK INTO ENGLISH

Whenever he eats it with a House cat mouse