YOU SAID:
the pen of my aunt is in the blue cow
INTO JAPANESE
私の叔母のペンは青い牛の中にいる
BACK INTO ENGLISH
My aunt's pen is in a blue cow
INTO JAPANESE
私の叔母のペンは青い牛にいる
BACK INTO ENGLISH
My aunt's pen is in a blue cow
You've done this before, haven't you.