query

In the statement "smoking is a revolting habit" what part of speech is smoking?

What is the difference between a possessive pronoun and a possessive adjective, e.g. in the statement "this is my book" my would be a possessive pronoun but in the statement "it's not yours" would yours be a possessive pronoun or a possesive adjective?

Thank you.

Do you mean 'smoking' functions as subject?

I'd say 'my' is a possesive adjective because it goes with 'book' - a noun.

And 'yours' a possesive pronoun because it functions as a substitute for the noun.

Grammar was never my forte, anyway.

Thanks Rebel - I'm sure you are right!