Some concrete nouns are countable nouns. Countable nouns have both a singular and a plural form.
A brick. Two bricks.
A book. Three books.
A horse. Four horses.
Uncountablee concrete nouns do not have a plural form. We can’t separate them into individual elements to count. Milk, air, sugar, salt, wood, rice, electricity and water are also uncountable nouns. Concrete nouns can be collective nouns, common nouns, and proper nouns as well.
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