Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions. I know (about) this difficulty/problem. In the first sentence, it seems to me that to know expresses that the speaker experienced the problem/difficulty.
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. Alright, well, for example, like on saturdays, y’know, what i liked to do. Also explain the difference between the two, thanks.
In (2), however, the object of. It's not just you that don't know. Can it be used in formal conversation/writing? Please let me know as soon as you figure it out.
What is the correct usage of phrase you don't know what you don't know? For me, know implies knowledge of details or individual pieces, while am aware of implies a knowledge only of a whole. However, i am having trouble figuring out why (or whether) this is the correct way to write the sentence,. I saw this sentence in the book 1q84:
Why would you have a problem with this?