YOU SAID:
Haven't you ever heard of knocking?
INTO JAPANESE
ノックなんて聞いたことないの?
BACK INTO ENGLISH
You've never heard of a knock?
INTO JAPANESE
ノックを聞いたことがないのか?
BACK INTO ENGLISH
Haven't you heard of the knock?
INTO JAPANESE
ノックは聞いたことがないの?
BACK INTO ENGLISH
Haven't you heard of the knock?
That didn't even make that much sense in English.