Gerçek onun hakkında bir şey bilmememdir.
- The truth is that I don't know anything about it.
Fark ettin mi, bilmem; ama Tom senin kızına abayı yakmış gibi duruyor.
- I don't know if you've noticed, but Tom seems to have fallen in love with your daughter.
I dunno the answers to any of those questions, and you dunno and he dunno either.
... You can't secure the software on your computer if you don't know what software is running ...
... They don't know what the crop prices are in ...