Gerçek onun hakkında bir şey bilmememdir.
- The truth is that I don't know anything about it.
Benim bilmemi istemediğin şeyi bilmiyorum. Yani neyi bilmek istediğimi bilmiyorum.
- I don't know what you don't want me to know, so I don't know what I want to know.
I dunno the answers to any of those questions, and you dunno and he dunno either.
... I don't know about Mexico, whether they have sufficient ...
... I don't know if there's any pianists in this room. ...