Here's why:
* Demonstrative pronouns (this, that, these, those) are used to point out specific things.
* They often refer to tangible objects that are close or far away, singular or plural.
* While you can sometimes use them to refer to people (e.g., "This is my friend"), it's less common and can sound a bit formal or even awkward.
For example:
* This book is interesting. (object)
* That house is beautiful. (object)
* These cookies are delicious. (objects)
* Those cars are fast. (objects)
Instead of using demonstrative pronouns for people, you would typically use personal pronouns:
* He is my friend.
* She is the one I told you about.
* They are my parents.
Let me know if you have any other questions!