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