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