Demonstrative Adjectives and Pronouns

To differentiate between things in English, use either:

this
that
these
those

Any of these demonstratives can be used with a noun or by itself. This (singular) and these (plural) refer to something or someone close at hand. That (singular) and those (plural) refer to something or someone a bit farther away.

EXAMPLES:

--Do you want this box or that box?

--I"d like some of that popcorn.

--Do you want these or those?

--This apartment is nicer than that one