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Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions Please let me know as soon as you figure it out. 'know of' is used when you have personal experience with wha.

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In (2), however, the object of know is not indicated, as you point out, so something must be provided. Why would you have a problem with this 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 to question, and you are answering that challenge)

Therefore, saying did you know asks if you have previously known something

Do is the present tense, so saying do you know would ask if you currently know. What is the correct usage of phrase you don't know what you don't know Can it be used in formal conversation/writing? It's not just you that doesn't know

Now, according to owl.purdue.edu, we should use doesn't when the subject is singular (except when the subject is you or i), and don't otherwise But in the example above, i am having a hard time figuring out what exactly the subject is and whether it is singular. Alright, well, for example, like on saturdays, y’know, what i liked to do. Why do you think that he doesn't know him from his schooldays means that he does know him

It would only have that sense if you added something like in fact, he first met him at university.

I've been thinking that the phrase already know is different from the phrase have already known I know something clearly at this point of saying (present) have already known I've known something so far (present perfect) i may be confused in the explanation

I don't know when we can use each of these phrases properly