Second Grade English: Irregular Plurals (child/children, mouse/mice, tooth/teeth)

While most nouns follow the predictable rules of adding -s or -es to become plural, the English language features a famous collection of rebel words that refuse to follow the standard pattern. These words are known as irregular plural nouns. Instead of simply attaching an ending, irregular plurals transform their internal vowel sounds, change their spelling entirely, or surprisingly make zero changes at all! In this chapter, you will master the most common irregular plural nouns in second grade, understand why they change, and practice using them accurately in speech and writing.

What Makes a Plural Irregular?

An irregular plural noun is a noun that forms its plural in a way other than adding -s or -es to the base word.

+-----------------------------------------------------------------+
|                    REGULAR VS. IRREGULAR PLURAL                 |
+-----------------------------------------------------------------+
|                                                                 |
|   REGULAR:   dog  +  -s  =  dogs     (Base word stays the same!)|
|                                                                 |
|   IRREGULAR: man  --->   men         (Internal vowel flips!)    |
|              tooth --->  teeth       (Double 'o' becomes 'ee'!) |
|              mouse --->  mice        (Spelling transforms!)     |
|                                                                 |
+-----------------------------------------------------------------+

Never Add -s to an Irregular Plural!

One of the most common mistakes young writers make is adding an extra -s to a word that is already plural. Writing "childrens," "mouses," or "feets" is incorrect. Once child becomes children, the word is already completely plural!

Master Families of Irregular Plural Nouns

Irregular plurals group into four distinct, fascinating spelling patterns.

+-----------------------------------------------------------------+
|                 IRREGULAR PLURAL NOUN DIRECTORY                 |
+-----------------------------------------------------------------+
|  Pattern Type     | Singular (1)     | Plural (More Than 1)     |
+-------------------+------------------+--------------------------+
|  Internal Vowel   | foot             | feet                     |
|  Change           | tooth            | teeth                    |
|                   | goose            | geese                    |
|                   | man              | men                      |
|                   | woman            | women                    |
+-------------------+------------------+--------------------------+
|  The -ren Ending  | child            | children                 |
|                   | ox               | oxen                     |
+-------------------+------------------+--------------------------+
|  The -ice Ending  | mouse            | mice                     |
|                   | louse            | lice                     |
+-------------------+------------------+--------------------------+
|  The -ves Ending  | leaf             | leaves                   |
|  (f/fe to -ves)   | wolf             | wolves                   |
|                   | loaf             | loaves                   |
|                   | shelf            | shelves                  |
|                   | life             | lives                    |
|                   | knife            | knives                   |
+-------------------+------------------+--------------------------+
|  Zero-Change      | sheep            | sheep                    |
|  (Stays Same!)    | deer             | deer                     |
|                   | fish             | fish                     |
+-----------------------------------------------------------------+

Family 1: The Vowel Flippers (Double O to Double E)

Notice how oo flips to ee: One foot -> two feet One tooth -> thirty-two teeth One goose -> a flock of geese

Family 2: The -f and -fe to -ves Transformers

When a noun ends in f or fe, the harsh /f/ sound softens into a buzzing /v/ sound when pluralized: leaf becomes leaves wolf becomes wolves shelf becomes shelves knife becomes knives

Family 3: The Chameleon Children and Mice

Child adds the ancient plural ending -ren to become children. Mouse transforms into mice.

Family 4: The Zero-Change Animal Twins

Some animals look exactly identical whether you have one or one hundred! One sheep in the meadow -> ten sheep in the meadow. One deer in the forest -> five deer in the forest. One fish in the pond -> a school of fish in the pond.

Using Context to Detect Zero-Change Plurals

Because zero-change words look the same, you must look at the helping verb or number words to know if the noun is singular or plural.

+-----------------------------------------------------------------+
|                 ZERO-CHANGE DETECTION EXAMPLES                  |
+-----------------------------------------------------------------+
|  "The deer IS grazing quietly."  --> Singular (helped by "is")  |
|  "The deer ARE running swiftly." --> Plural (helped by "are")   |
+-----------------------------------------------------------------+

Practice Exercises

Exercise 1: Write the correct irregular plural form for each of the following singular nouns: woman, tooth, shelf, child, deer, mouse.

Exercise 2: Correct the errors in the following sentence: "The two mans saw three mouses eating the loafs of bread."

Exercise Solutions

Solution to Exercise 1: The correct irregular plural forms are women (for woman), teeth (for tooth), shelves (for shelf), children (for child), deer (for deer, stays identical), and mice (for mouse).

Solution to Exercise 2: The corrected sentence is: "The two men saw three mice eating the loaves of bread." In this sentence, mans is corrected to men, mouses is corrected to mice, and loafs is corrected to loaves.