YOU SAID:
I have no idea what this doohickey does.
INTO JAPANESE
私はこのドゥーヒッキーが何をしているのか分かりません。
BACK INTO ENGLISH
I don't know what this Doochy is doing.
INTO JAPANESE
私はこのドゥーチーが何をしているのか分からない。
BACK INTO ENGLISH
I don't know what this Doochy is doing.
You've done this before, haven't you.