Countable nouns have both a singular and a plural form. Most nouns are countable, because they refer to things that can be counted. By contrast, a smaller number of nouns do not regularly have a plural form and are called uncountable. Example include: mud, snow, butter.
In addition, many Abstract nouns are normally uncountable. For example: unhappiness, dead, darkness.
Many uncountable nouns can, however, also be used in the plural in certain circumstances. For example: beer is usually uncountable, but can be a countable in sentences such as:
Beers of the world.
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