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Countable nouns are things you can count: one sandwich, two sandwiches, three cakes.
a sandwich · two sandwiches · three cakes
For one countable thing, use a or an: a sandwich, an apple.
Uncountable nouns are things you do not count one by one: water, bread, milk, sugar, soup.
some water · some bread · some milk
a water ✗ → some water ✓