Noun Determiners

Nouns are also often preceded by noun determiners, demonstratives, and possessive adjectives that indicate the number of the noun. Noun determiners include definite and indefinite articles and quantifiers.

Definite Articles (used for both singular and plural nouns) Indefinite Articles (used with singular nouns that are not specific)
the woman a rock
the sky an apple
any taxi
that question
those apples
this paper
some apple
whatever taxi
whichever taxi

Many determiners also express quantity. Choosing the correct determiner can also be done by identifying if the noun it refers to is a count or a mass noun. Count nouns are nouns that can be quantified or counted with a number. Mass nouns are uncountable by a number. Mass nouns are quantified by a word that signifies amount.

Count Nouns Mass Nouns
peso money
glass water
students happiness