YOU SAID:
I'm surprised you haven't been slapping her around.
INTO JAPANESE
あなたが彼女を平手打ちしていないことに驚いています。
BACK INTO ENGLISH
I'm surprised you didn't slap her.
INTO JAPANESE
あなたが彼女を平手打ちしなかったことに驚いています。
BACK INTO ENGLISH
I'm surprised you didn't slap her.
Okay, I get it, you like Translation Party.