This / That / These / Those 

Demonstrative Pronouns

We use this (singular) and these (plural) to refer to something that is here / near.

Examples:

This is my car. (singular)

These are our children. (plural)

We use that (singular) and those (plural) to refer to something that is there / far.

Examples:

That is our house. (singular)

Those are my shoes. (plural)

Note that the verb changes (i.e. singular / plural) depending on the pronoun that you use.

Demonstrative Adjectives

You can also use demonstratives before a noun. These are called demonstrative adjectives.

The Demonstrative Adjective needs to agree (= be the same form) as the noun.

Examples of demonstrative adjectives:

This party is boring. (singular)

That city is busy. (singular)

These chocolates are delicious. (plural)

Those flowers are beautiful. (plural)