YOU SAID:

Someone must have cows here!

INTO JAPANESE

誰かここに牛がいるに違いない！

BACK INTO ENGLISH

Someone must have a cow here!

INTO JAPANESE

誰かがここで牛を飼う必要があります！

BACK INTO ENGLISH

Someone needs to keep a cow here!

INTO JAPANESE

誰かがここに牛を飼う必要があります！

BACK INTO ENGLISH

Someone needs to keep a cow here!