Articles with Countable and Uncountable Nouns

The choice of article depends on whether a noun is countable or uncountable. Countable nouns can be counted — one book, two chairs, three ideas — and use "a" or "an" in the singular: "I need a pen." Uncountable nouns cannot be counted individually. Common uncountable nouns include water, advice, furniture, information, news, and homework. They never take "a" or "an" — you cannot say "an advice" or "a furniture." For general meaning, use no article: "I need information."

When talking about something specific, both types can use "the": "the water in this glass," "the book on the table." To express a quantity of an uncountable noun, add a countable container or unit: "a glass of water," "a piece of advice," "two slices of bread." Other commonly confused uncountable nouns include "luggage" (not "a luggage"), "traffic" (not "a traffic"), and "research" (not "a research"). This topic appears regularly in Cambridge A2 Key and B1 Preliminary examinations.