The list below is taken from Barbara Abbott's 'Definiteness and Indefiniteness.' Why do you think the is used before 'personal pronouns' but not before 'demonstrative pronouns' or 'demonstrative determiners'?
I cannot exactly reproduce her list here. If you would take the trouble of going to the actual site and see Table 1, it would be much appreciated.
- NP type: Pronouns
- More details: the personal pronouns
- Examples: I, you, she, them
- NP type: Demonstratives
- More details: demonstrative pronouns; NPs with demonstrative determiners
- Examples: This, that, this chair over here