This document discusses irregular plural nouns in English and provides rules for forming plurals of certain types of irregular nouns. It gives examples of nouns that change spelling in their plural forms, like "man - men" and "foot - feet". It also lists nouns that don't change at all in plural, like "sheep - sheep". The document tests the reader's knowledge by asking them to identify the plural forms of sample irregular nouns.

1. Irregular
Nouns
Lesson #4, First Quarter

2. Irregular Plural Nouns
These are nouns that change their
spelling when forming it’s plural.
man – men
foot – feet
child - children

3. Rule #1 – If the singular noun
ends in -us, the plural ending is
frequently -i.
Example:
cactus – cacti
focus – foci

4. Rule #2 – If the singular noun
ends in -is, the plural ending
is -es.
Example
analysis – analyses
ellipsis – ellipses

5. Rule #3 – If the singular noun
ends in -on, the plural ending
is -a.
Example
phenomenon – phenomena
criterion – criteria

6. Rule #4 – Some nouns don’t change
at all when they’re pluralized.
Example
sheep – sheep trout - trout
series – series shrimp - shrimp
fish – fish salmon - salmon
deer – deer species – species

7. Some irregular nouns do not have
specific rule in forming their plural, so
it’s best to memorize these or look up
the proper pluralization in the
dictionary.

8. child – children
goose – geese
man – men
woman – women
tooth – teeth
foot – feet
mouse – mice
person – people

9. Identify the plural form of the
following irregular nouns. Type
your answer in the Zoom Chat
box.
man
men

10. Identify the plural form of the
following irregular nouns. Type
your answer in the Zoom Chat
box.
parenthesis
parentheses

11. Identify the plural form of the
following irregular nouns. Type
your answer in the Zoom Chat
box.
alumnus
alumni

12. Identify the plural form of the
following irregular nouns. Type
your answer in the Zoom Chat
box.
trout
trout

13. Identify the plural form of the
following irregular nouns. Type
your answer in the Zoom Chat
box.
child
children