A demonstrative adjective goes right in front of a noun and points to that noun. We have three demonstrative adjectives in the English language: this, that, and those. Notice how each of these words points to the noun that follows it in a sentence. The demonstrative adjective demonstrates which object is being talked about.
I would like to read that book.
I’m wearing this dress to the wedding.
Dad says those boxes should be thrown away.
Use the demonstrative adjectives – this, that, those – to point directly to the noun you are talking about. This and that usually point to a singular noun. Use those with a plural noun.
▶Find the two demonstrative adjectives in this sentence: Do you want to read this book or watch those movies? That wasn’t too difficult, was it?