'know of' is used when you have personal experience with wha. In (2), however, the object of know is not indicated, as you point out, so something must be provided. 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. 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) 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. Thus, as far as i know, bob is happy over bob is happy, so far as i know They are equivalent in meaning therefore, but choice of one over another betrays, for me, certain prejudices I also sense that so far as sounds slightly antiquated and is losing ground. Can anyone give use cases and examples for happen to know came to know got to know came across i always gets confused in their uses.
And explain why the others are wrong No one knows the answer No one know the answer There is nobody anwering the qustion That's a known unknown (to me) A question i know has an answer, which answer i do not know
Which of the following sentences is correct in a formal context If possible, please also explain why each of these sentences is correct/incorrect I do not know where the best place to ask
OPEN
