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As the term suggests, countable nouns are nouns that can be counted. Examples of countable nouns are crane, truck,
CD, ring, tyre and wheel. Countable nouns can either be singular or plural. Singular simply indicates one, while plural
indicates more than one. Here are some rules to change nouns from their singular form to the plural form.

RULES	EXAMPLES
RULES	Singular	Plural
Adding -s to the singular noun	turbine crowbar disk	turbines crowbars disks
Adding -es to nouns ending in -o, -s, -ss, -sh, -ch, and -x	brush watch box gas class potato	brushes watches boxes gases classes potatoes
Dropping the -y and adding -ies to nouns ending with -y	country lorry fly	countries lorries flies
Adding -s to nouns that end with -y following a vowel sound	survey storey day	surveys storeys days
Some nouns have vowel change in order to indicate plurality	man woman	men women
For nouns ending in -f or -fe, drop the -f or -fe and add -ves	wife life knife self	wives lives knives selves
The names of some fish and animals do not change, even in the plural form	fish, deer, trout, salmon, grouse, sheep
Some singular nouns change the last two letters in their plural form	antenna bacterium criterion datum medium stratum	antennae bacteria criteria data media strata

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