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The noun "oil" can be both countable and uncountable.

oil → uncountable

Meaning: a thick liquid, such as the dark liquid from underground that's used to make fuel, or a thick liquid that's used for cooking food

Example sentence: Many countries in the Middle East make a lot of money from exporting oil.

oil → countable

Meaning: a particular type of oil

Example sentence: My daughter's a vegetarian, so we have lots of different vegetable oils in our kitchen cupboards.

Quick Quiz:

In which sentence is the word "oil" uncountable?

a. How many vegetable oils did they sell at the supermarket?

b. How much vegetable oil did you buy at the supermarket?

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Contributor: Matt Errey