It is important to first explain that demonstrative pronouns can be singular or plural and that they make reference as well to distance.
Demonstrative pronouns can be accompanied by a noun, as in the examples above, or they may be found alone, as in the following examples.
Other Uses of Demonstrative Pronouns
1. We use “this” when we present ourselves to someone on the telephone.
2. We use “that” when we are not sure with whom we are speaking.
3. We use “this” when we are introducing people.
4.“That” can be used to refer to something in the past.
Note: “That pizza” can be either a pizza we just finished eating or one that we ate on our holidays last year.