They keep their car in the garage.
The following sentence contains a plural noun.
They keep their cars in the garage.
Plural nouns indicate there is more than one of something.
Making plural nouns
When a noun the ends in s, x, ch, or sh, add es to the end:
There is a an old church in the village.
There are two old churches in villages.
When word ends in z, add zes to the end:
We did a quiz in school.
We did some quizzes in school.
When a noun ends in vowel + y, add s:
We have to write an essay.
We have to write some essays.
When a noun ends in consonant + y, change the y to ies:
We should throw a party.
We should throw parties.
When a noun ends in f or fe, change f to v and add es:
There’s a knife in the cupboard.
There’re knives in the cupboard.
When a word in ends in o, add es:
Would you like a tomato?
Would you like some tomatoes?
When the noun ends in is, change the is to es:
We need a new hypothesis.
We need new hypotheses.
Some nouns are the same in singular and plural:
There’s a sheep in the field.
There are sheep in the field.
Some nouns have irregular forms:
Who is that man?
Who are those men?