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.
Why would you have a problem with this? 'know of' is used when you have personal. What is the correct usage of phrase you don't know what you don't know?
Also explain the difference between the two, thanks. Alright, well, for example, like on saturdays, y’know, what i liked to do. In (2), however, the object of. I saw this sentence in the book 1q84:
Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions. Using your example, knowing my rights means that i know i have. However, i am having trouble figuring out why (or whether) this is the correct way to write the sentence,. Please let me know as soon as you figure it out.
It's not just you that don't know.