لو سمحتوا ابي شرح بسيط The difference between Demonstrative pronoun and adjective
 

The difference between Demonstrative pronoun and adjective
Demonstrative Adjectives point out specific nouns and include the nouns themselves. For example, we can point out one particular dog by saying "this dog" or "that dog". We include the word "dog" in the statement.
The Demonstrative Pronouns serve the same purpose as the Demonstrative adjectives in pointing out a specific noun, BUT they replace the noun itself:
Instead of saying "I like this dog better that that dog," we can say "I like this dog better than That One." The phrase "that one" means "that dog", but by using the demonstrative pronoun we don't need to repeat the noun "dog".
The difference between indefinite pronoun and indefinite adjective
Indefinite adjective it functions as the adjective that modifies the object
e.g. we caught several dogs – I read several books
Indefinite pronouns it functions as either the subject or the object
e.g. She loves everyone – Everybody loves her
ومشكورررين واتمنى المساعده لانه درس ومحتاجه افهمه :b8: