YOU SAID:
What have you been up to all day over there with that horse?
INTO JAPANESE
あの馬と一日中何をしていたの?
BACK INTO ENGLISH
What have you been doing with that horse all day?
INTO JAPANESE
あなたは一日中その馬で何をしてきましたか?
BACK INTO ENGLISH
What have you been doing with that horse all day?
You should move to Japan!