what is the most common way to form the plural of a noun?
Plurals of nouns. Most nouns make their plurals by simply adding âs to the end (e.g. cat/cats, book/books, journey/journeys). Some do change their endings, though. The main types of noun that do this are: Nouns ending in -y. If the noun ends with a consonant plus -y, make the plural by changing -y to -ies: