Demonstrative Adjectives

This, that, these, and those are often called demonstratives or demonstrative adjectives.

-This and these are used to talk about people or things that you are very obvious in the situation that you are in.

*I like this college.
*I´m going to walk up these steps towards you.

This - singular
these - plural

You use that and those when you are talking about things or people that you can see but are not close to you.

*How much is it for that big box?
*Can you move those books over there?

that - sing.
those - Pl.