Why do we add S to some words but ES to others? And when a word ends with Y, how do we know whether to change the Y to I before adding the plural suffix? And why on earth does knife become knives? You can unravel these mysteries with six simple rules.
Rules for Plural Nouns - Here is a simple poster to help kiddies understand the different rules when changing nouns from singular form to plural form. There are obviously always exceptions to every rule, however these rules apply in most cases.
Plural or Possessive? Use the plural or possessive form of each noun to complete the sentence. Great grammar exercise for grade! Practice with plurals for or grade. This can be homework or an in class activity.