Quote:
| I got used to your being here. |
I will answer the second question.
"Here" is an adverb. Obviously an adverb does not modify a noun.
In fact it modifies "being", which is ocnsidered as a non-finite verb.
The original sentence was:
I got used to the fact [that you are here]
By applying some transformational rules, the above sentence became: ....your being here.
In fact, "being" is not a noun but a verb.
As for your question about your/you, actually it is NOT possible to use "you". Why? Because the subject of a non-finite verb should be "your" and not You. "You", when coming as a subject, must take a finite verb.
You are here
vs.
your being here.
Examples:
I do not agree that
she stays here.
=>
I do not agree
her staying here.