The document summarizes the differences between countable and uncountable nouns in English. [1] Countable nouns can be counted and can be singular or plural, taking articles like "a" or "the" when singular. [2] Uncountable nouns refer to mass nouns or abstract concepts that cannot be counted, usually taking singular verbs and no indefinite article. [3] Both countable and uncountable nouns can be used with quantifiers like "some", "any", "a little", and "much".