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.	noise	It's difficult to work when there is too much noise.
Have you got a paper to read? (= newspaper)	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.	time	Have you got time for a 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):