Countable nouns. Pizza is a countable noun. When pizza is a countable noun, it is translated as a piece of pizza. How to judge countable nouns and uncountable nouns: countable nouns can be counted in number, can be divided into individual people or things, and have plural forms. When the plural form is the subject in a sentence, the predicate of the sentence should also be in plural form. Uncountable nouns are things that cannot be counted in number, cannot be divided into individual concepts, states, qualities, emotions, or represent material materials.