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'know of' is used when you have personal. Why would you have a problem with this? Can it be used in formal conversation/writing?
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Also explain the difference between the two, thanks. You would use the present perfect to express something that happened previously, without specifying the time. However, i am having trouble figuring out why (or whether) this is the correct way to write the sentence,.
I know (about) this difficulty/problem.
I already know how to turn on the television. What is the correct usage of phrase you don't know what you don't know? In the first sentence, it seems to me that to know expresses that the speaker experienced the problem/difficulty. I saw this sentence in the book 1q84:
Please let me know as soon as you figure it out. 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. It's not just you that don't know.
Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions.
I know how to drive a car. In (2), however, the object of.
