Many countable nouns are concrete (having an individual physical existence) for example
Persons, animals, plants a girl a horse a geranium
Objects a bottle a desk a typewriter
Groups an army a crowd a herd
Units of measurement a franc a kilo a litre a metre
Parts of a mass a bit a packet a piece a slice
Concrete uncountable nouns (sometimes having physical but not
'individual' existence) include words like
Materials, liquids, gases cotton milk air
'Grains' and 'powder' barley rice dust flour
Activities camping drinking eating sailing
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2 Nouns
A few countable nouns are abstract: e.g. a hope, an idea a nuisance a remark a situation. A number of abstract nouns can be used only as countables: e.g. a denial a proposal a scheme a statement Many uncountable nouns are abstract: e.g. anger, equality, honesty
Nouns which can be either countable or uncountable
Some nouns may be countable or uncountable depending on their use.
2.16.1 Nouns we can think of as 'single items' or 'substances'
e.g. a chicken/chicken an egg/egg. a ribbon/ribbon
When we use these as countables, we refer to them as single items; when we use them as uncountables, we refer to them as substances.
countable (a single item) uncountable (substance/material)
He ate a whole chicken! Would you like some chicken?
I had a boiled egg for breakfast There's egg on your face
I tied it up with a ribbon I bought a metre of ribbon
Nouns which refer to objects or material
e.g. a glass/glass an ice/ice, an iron/iron, a paper/paper
When we use such nouns as countables, we refer to e.g. a thing which is made of the material or which we think of as being made of the material; when we use them as uncountables, we refer only to the material.
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countable ('thing') uncountable ('material')
/ broke a glass this morning Glass is made from sand.
Would you like an ice? Ice floats
I've got a new iron Steel is an alloy of iron
What do the papers say? Paper is made from wood