* Subject of a verb: This is a great idea.
* Object of a verb: I like this one.
* Object of a preposition: Let's go to that one.
* Complement of a verb: The best one is that.
* Appositive: That, a beautiful painting, is worth a fortune.
Here's a breakdown of the functions:
* Subject: The demonstrative pronoun acts as the person or thing performing the action of the verb.
* Object: The demonstrative pronoun receives the action of the verb.
* Object of a preposition: The demonstrative pronoun follows a preposition (like "to," "from," "with," etc.).
* Complement: The demonstrative pronoun completes the meaning of a verb or adjective.
* Appositive: The demonstrative pronoun provides additional information about another noun or pronoun.
Note: Demonstrative adjectives function as modifiers and are placed before nouns, such as "this book" or "that house."