Some plurals don't add -s: child becomes children and tooth becomes teeth. Words from Latin and Greek often keep their own plurals (criterion, criteria), and some nouns are always plural (scissors, trousers). The answer key is at the end.
Learn the rules first: Irregular Plurals: Latin and Greek Foreign Plurals List · Nouns Always Plural or Singular: Pluralia Tantum Rules
Practise online, with instant answers: Nouns practice test (Basic)
Irregular Plurals Worksheet with Answers
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A. Common irregular plurals
Write the plural.
- child
- man
- woman
- foot
- tooth
- mouse
- goose
- ox
- sheep
- person
B. Latin and Greek plurals
Write the classical plural.
- crisis
- criterion
- phenomenon
- datum
- medium
- alumnus
- analysis
- bacterium
C. Choose the verb
Circle the correct verb.
- These criteria (is / are) used for selection.
- My trousers (is / are) too long.
- The news (is / are) good today.
- The scissors (is / are) on the table.
- The bacteria (was / were) found in the water.
D. Correct the mistakes
Each sentence has one mistake. Write the sentence correctly.
- There are many childs in the park.
- I brushed my tooths.
- This phenomena is strange.
- She bought two new furnitures.
Answer Key
A. Common irregular plurals
- children
- men
- women
- feet
- teeth
- mice
- geese
- oxen
- sheep
- people
B. Latin and Greek plurals
- crises
- criteria
- phenomena
- data
- media
- alumni
- analyses
- bacteria
C. Choose the verb
- are
- are
- is
- are
- were
D. Correct the mistakes
- There are many children in the park.
- I brushed my teeth.
- This phenomenon is strange. (or: These phenomena are strange.)
- She bought two new pieces of furniture.