YOU SAID:

ah happy boy, you need to go and pet that cat there

INTO JAPANESE

ああ幸せな少年、あなたはそこにその猫を飼いに行く必要があります

BACK INTO ENGLISH

Oh happy boy, you have to go there to pet that cat

INTO JAPANESE

ああ幸せな少年、あなたはその猫をペットにそこに行かなければならない

BACK INTO ENGLISH

Oh happy boy, you have to go there to pet that cat