The plural is the form of a verb, pronoun, noun, etc., used when talking or writing about something of which there as more than one:
She arrived yesterday. (She = one person - singular)
They are leaving soon. (They = more than one person - plural)
Count Nouns have singular and plural forms. The regular plural form is made by the addition of an -s inflection to the end of the word.
one day; two days
Nouns ending -ch, -sh, -s, -ge, -x take -es in the plural.
A church; two churches
A smash; two smashes
A bus; two buses
Nouns ending -consonant + y and change the -y to -ie in the plural.
A ferry; two ferries
A lady; two ladies
Nouns ending -vowel + y do not change the -y, forming plurals the normal way.
A way; two ways
A play; two plays
Exceptions: i) Proper Nouns- the Kennedys
ii) Compounds ending with the preposition 'by'; layby laybys.
Nouns ending -o
Most can have either -os or -oes.
Cargoes cargos
A noun ending vowel +o or an abbreviation take only -os.
Radios studios
kilos photos
The following nouns take only -oes:
echoes; embargoes; goes; heroes; noes; potatoes; tomatoes; torpedoes; vetoes