[Mohammed Abu Risha]

Soup

Thank you very much for your remark.

Interesting. Is it correct in spoken English to say "you"? very interesting indeed.

Randolph Quirck focuses only on written English grammar.

As for "your being" point, according to Strcuture 1 and Strcuture 2 (Two books in syntax which heavily rely on Quirk et al), a clause can be divided into two types (according to verb form parameter):

A finite clause (Example: You are here.)
A non-finite clause (Example: your being here)

The point I am raising now is that "your" DOES NOT modify "being". Rather, it is a subject!

To explain the matter we may review the classification of a non-finite clause according to subject:

Subject-explicit nonfinite clause
Subject-implicit nonfinite clause.

When you say:

your being here---> This clause is nonfinite. It has an EXPLICIT subject (that is: your) and a nonfinite verb: being.

When you say:

being here --> This clause in non-finite. It has an IMPLICIT subject (The subject is there but hidden) and it has a non-finite verb "being"

This issue is very complex and cannot in fact be encompassed in one or two posts.

Regards
Mar