Noun (English: noun, abbreviated as N.) is a part of speech and belongs to content words. It represents a unified name for people, things, things, places or abstract concepts.
Divided into proper nouns and common nouns.
In English, there are three cases of nouns: nominative case, objective case and possessive case. Among them, individual nouns refer to individuals in a certain kind of people or things, such as girls. Collective noun represents a collection of individuals, such as the audience. Material nouns refer to objects that cannot be divided into individuals, such as water; Abstract nouns represent abstract concepts such as action, state, quality and feeling, such as work and happiness.
Common nouns can be divided into countable nouns and uncountable nouns.