C is the abbreviation of countable; N is the abbreviation of noun. Countable noun: countable noun, abbreviated as cn. And uncountable nouns are uncountable nouns, abbreviated as un.

Extended data:

Numeral nouns are divided into individual nouns (indicating individuals in a certain kind of people or things, such as workers, farmers, desks, factories, etc.) ) and collective noun (indicating a group of people or things as a whole, such as people, families, etc. If the things represented by ordinary nouns cannot be counted by numbers, such nouns are called uncountable nouns.

Countless nouns can be divided into material nouns (indicating substances that cannot be divided into individuals, such as meat, rice, water, milk, orange, etc. ) and abstract nouns (representing abstract concepts such as action, state, situation and quality. ).

Matters needing attention

1, countable nouns are nouns that can be used for counting. Countable nouns have singular and plural forms. Such as: desk-desk-desk, apple-apple, etc. Uncountable nouns are nouns that cannot be directly used for counting. Uncountable nouns have no plural form, only singular form. Such as: some bread, a little milk, etc.

2. When singular countable nouns are used for general reference, the indefinite article a(an) should be used in front, and when used for specific reference, the definite article The should be used in front; However, uncountable nouns cannot be modified by a(an). When expressing a specific meaning, the definite article the must be used in front.