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Understanding the Context

Examples: I know (about) this difficulty/problem. I know (about) Engineering. In the first sentence, it seems to me that "to know" expresses that the speaker experienced the problem/difficulty before while "to know about" only expresses that the speaker has heard or read about it. Why do you think that He doesn't know him from his schooldays means that he does know him?

Key Insights

It would only have that sense if you added something like In fact, he first met him at university. I've just seen someone comment: We send our children to fight in a war we know not what we are fighting for. I am not English expert (it's not even my first language) but the structure just seems w... Do you know that he will be our coach? Do you know if he will be our coach?

Final Thoughts

I think both sentences are grammatically ok, just meaning two different things. In the first sentence, it's decided th... In my understanding, ' as we know it ' usually follows a noun phrase and means like The building as we know it = the version/condition of the building we know now. First, I'm not sure about its grammar. Is the 'as' a conjunction? Is it correct to think that 'it' changes to 'them'?

E.g., the buildings as we know them Second, a question about its use. Is it possible to use when the preceding ...