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. It's not just you that don't know. 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: Also explain the difference between the two, thanks. In the first sentence, it seems to me that to know expresses that the speaker experienced the problem/difficulty.
Can it be used in formal conversation/writing? In (2), however, the object of. What is the correct usage of phrase you don't know what you don't know? 'know of' is used when you have personal.
Why would you have a problem with this? For me, know implies knowledge of details or individual pieces, while am aware of implies a knowledge only of a whole. Alright, well, for example, like on saturdays, y’know, what i liked to do. Please let me know as soon as you figure it out.
I know (about) this difficulty/problem.