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

jam → uncountable

Meaning: sweet food that's made from fruit and usually spread on bread or toast

Example sentence: Would you like some strawberry jam with your toast, madam?

jam → countable

Meaning: many vehicles stuck together in traffic, or a difficult situation

Example sentence: Brad said he was late because he was caught in a traffic jam.

Quick Quiz:

In which sentence is the word "jam" countable?

a. We couldn't get to the supermaket in time because of the traffic jam.

b. We haven't got jam because we couldn't get to the supermaket in time.

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Contributor: Matt Errey