Demonstrative pronouns are the words we use to refer to a noun according to its physical or temporal distance, they also agree in gender and number with the noun they refer to.
Before choosing the right demonstrative we have to ask ourselves 3 questions:
- Distance = Is the noun near, far, or middle distance?
- Gender = Is the noun masculine or feminine?
- Number = Is it plural or singular?
Note: When we do not name the noun in the sentence we have to use a neuter demonstrative.