pronouns vs. adjectives
Demonstrative pronouns are the same pronouns used for demonstrative adjectives - this, that, these and those. The difference is in the sentence structure. The demonstrative pronoun takes the place of the noun phrase. If it is not preceding a noun or pronoun-it is probably serving as a demonstrative pronoun. Demonstrative adjectives are adjectives that are used to modify a noun so that we know which specific person, place, or thing is mentioned. They come just before a noun to express which one.
A possessive adjective is an adjective that is used to show ownership. It comes before a noun in the sentence and lets us know to whom the noun belongs. A possessive pronoun does show ownership, but it does not come before a noun or in a noun phrase. It stands alone. It can also be used to replace a noun.
Examples:
Demonstrative adjectives: this, that, these, and those
That cat is adorable!
Demonstrative pronouns: this (singular), that (singular), these (plural), those (plural)
I don't think you're doing that right.
Possessive adjectives: my, your, his, her, its, our, their
My hair looks great.
Possessive pronouns: mine, yours, his, hers, its
That book is mine.