Here's why:
* Demonstrative pronouns point to specific things or people. They are used to show which person or thing is being referred to.
* Examples: This, that, these, those, such.
Examples of "such" as a demonstrative pronoun:
* "I've never seen such a beautiful sunset!"
* "Such is the nature of things."
Important Note: "Such" can also function as a determiner, modifying a noun. For example:
* "I've never seen such sunsets." (Here, "such" modifies the noun "sunsets".)