Although most nouns have plurals formed according to regular rules (see Regular Plurals of Nouns), some nouns have unusual, or irregular plurals. This page will introduce the most common ones, so that you can learn them.
Types of irregular plural
There are many types of irregular plural, but these are the most common:
|Noun type||Forming the plural||Example|
|Ends with -fe||Change f to v
|Ends with -f||Change f to v
|Ends with -o||Add -es||potato potatoes
|ends with -us||Change -us to -i||cactus cacti
|ends with -is||Change -is to -es||analysis analyses
|ends with -on||Change -on to -a||phenomenon phenomena
|ALL KINDS||Change the vowel
Change the word
Add a different ending
|Unchanging||Singular and plural
are the same
When you are sure that you understand the lesson, you can continue with the exercises.