This is my car.
These are my cars.
Her hair is beautiful.
Are these sentences correct? If so, where is the antecedent for This, These and Her?
Excellent question! I was also unsure, so I went to www.dictionary.com
. In the example you cite, "this" IS in fact a pronoun, indicating which car is my car. Thus, your antecedent is understood to be the car. The same situation applies with "these".
In the case of "her", "her" is functioning somewhat as an adjective, even though it is technically a pronoun. Whose hair is beautiful? Her hair is beautiful. However, for this to make sense you would have to have immediately been talking about the particular person "her" refers to. It makes no sense to walk up to someone and say "her hair is beautiful". But if you first said "Angelina Jolie is hot." and then followed that sentence with "her hair is beautiful", then that is sensible. In this case, the antecedent is implied through the earlier sentence or context.