This and that are used with singular nouns and these and those are used with plural nouns. In these examples, note the way the sentences below change based on whether the noun is singular or plural.
This and That
(singular nouns)
This and that are used when talking about singular nouns.
Change the noun and watch how this and that change based on the noun’s gender.
This and That
(when not next to a noun)
This and that stay in their neuter forms (dess and sell) when they’re not next to a noun.
These and Those
(plural nouns)
These and those are used when referring to plural nouns.
Change the nouns and notice how these and those stay the same when used with plural nouns.
These and Those
(when not next to plural nouns)
These and those stay in their neuter forms (dee and selli) when they’re not next to a noun.