What is a demonstrative determiner?

A demonstrative determiner (also called a demonstrative adjective) is a demonstrative word (“this,” “that,” “these,” or “those”) that is used to modify a noun. It comes just before the noun (e.g., “This steak is cooked perfectly”).

Demonstrative determiners can be singular (“this,” “that”) or plural (“these,” “those”) and indicate whether the noun is relatively close (“this,” “these”) or far (“that,” “those”) from the speaker.