Can it be used in formal conversation/writing? Please let me know as soon as you figure it out. 'know of' is used when you have personal.
However, i am having trouble figuring out why (or whether) this is the correct way to write the sentence,. In the first sentence, it seems to me that to know expresses that the speaker experienced the problem/difficulty. For me, know implies knowledge of details or individual pieces, while am aware of implies a knowledge only of a whole.
I know (about) this difficulty/problem. In (2), however, the object of. What is the correct usage of phrase you don't know what you don't know? It's not just you that don't know.
Why would you have a problem with this? Using your example, knowing my rights means that i know i have. I saw this sentence in the book 1q84: Alright, well, for example, like on saturdays, y’know, what i liked to do.
Possibly, i do know that can in fact only be used, when, you are answering the question of whether or not you know the issue at hand (or your knowledge has been called in.