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Nouns that can be Countable and Uncountable

Sometimes, the same noun can be countable and uncountable, often with a change of meaning.

Countable Uncountable
There are two hairs in my coffee! hair I don't have much hair.
There are two lights in our bedroom. light Close the curtain. There's too much light!
Shhhhh! I thought I heard a noise.
There are so many different noises in the city.
noise It's difficult to work when there is so much noise.
Have you got a paper to read? (newspaper)
Hand me those student papers.
paper I want to draw a picture. Have you got some paper?
Our house has seven rooms. room Is there room for me to sit here?
We had a great time at the party.
How many times have I told you no?
time Have you got time for a cup of coffee?
Macbeth is one of Shakespeare's greatest works. work I have no money. I need work!
Drinks (coffee, water, orange juice) are usually uncountable. But if we are thinking of a cup or a glass, we can say (in a restaurant, for example):
Two teas and one coffee please.

See also this list of nouns that are count and noncount, with example sentences, notes and quizzes