Irregular Plural Nouns Worksheet

By | June 20, 2025

Tired of the same old singular-to-plural drills? Spice up your grammar lessons with our engaging and comprehensive Irregular Plural Nouns Worksheet! Mastering irregular plural nouns is a crucial step in developing strong English language skills. Unlike regular nouns that simply add an “-s” or “-es” to become plural, irregular nouns have unique plural forms that must be memorized and understood. This worksheet provides a fun and interactive way for students to practice and solidify their knowledge of these tricky words. It’s perfect for elementary and middle school students, ESL learners, and anyone looking to brush up on their grammar!

Why are irregular plural nouns so important? Well, using the correct plural form makes your writing and speaking clear and professional. Imagine a doctor saying “I need to examine your foots!” It sounds odd, right? Using “feet” instead immediately conveys the correct meaning. Understanding these irregularities is essential for accurate communication and preventing misinterpretations. Our worksheet focuses on common irregular plural nouns, helping students recognize and correctly use them in various contexts. It goes beyond simple memorization by including exercises that encourage critical thinking and application of these rules.

This worksheet isn’t just about rote learning. We’ve designed it to be engaging and fun. It includes a variety of exercises, such as fill-in-the-blanks, sentence completion, and even a short story where students need to identify and correct incorrect plural forms. The activities are designed to reinforce learning in a practical and memorable way. We believe that learning grammar should be an enjoyable experience, and our Irregular Plural Nouns Worksheet is designed to achieve just that. Download it today and help your students conquer the complexities of English pluralization!

Irregular Plural Nouns Worksheet Answer Key

Below you’ll find the answer key to our Irregular Plural Nouns Worksheet. Use it to check your students’ work or to help them understand the correct answers. Remember to encourage them to think about *why* the plural form is irregular and not just memorize the answers. Understanding the patterns and exceptions will help them remember the rules more effectively.

Answer Key: Examples and Solutions

  • Child: children
  • Foot: feet
  • Tooth: teeth
  • Mouse: mice
  • Goose: geese
  • Man: men
  • Woman: women
  • Person: people
  • Ox: oxen
  • Deer: deer
  • Sheep: sheep
  • Fish: fish (or fishes in specific scientific contexts)
  • Louse: lice
  • Datum: data
  • Criterion: criteria
  • Medium: media
  • Focus: foci (or focuses)
  • Analysis: analyses
  • Thesis: theses
  • Diagnosis: diagnoses
  • Crisis: crises
  • Radius: radii (or radiuses)
  • Syllabus: syllabi (or syllabuses)
  • Fungus: fungi (or funguses)
  • Cactus: cacti (or cactuses)
  • Alumnus: alumni (male) / alumnae (female)

Explanation of some key irregularities:

  • Changing vowel sounds: Words like “foot” becoming “feet” and “mouse” becoming “mice” demonstrate a common pattern where the vowel sound changes to indicate plurality.
  • Adding “-en” or “-ren”: “Ox” becomes “oxen” and “child” becomes “children,” showing the addition of these suffixes to form the plural.
  • Words that stay the same: “Deer,” “sheep,” and often “fish” remain the same in both singular and plural forms. The context of the sentence usually indicates whether you’re referring to one or multiple.
  • Latin and Greek origin words: Nouns like “datum,” “criterion,” “medium,” and “focus” borrow their plural forms from their original Latin or Greek roots. While Anglicized versions (e.g., “focuses”) are sometimes accepted, the original forms (“foci,” “criteria”) are often preferred in formal writing.
  • Words ending in -is: Nouns ending in “-is” often change to “-es” in the plural, such as “analysis” becoming “analyses” and “crisis” becoming “crises.”

Remember to emphasize that language is constantly evolving, and some irregular plurals are becoming less rigid. However, mastering these traditional forms is crucial for a solid understanding of English grammar and for effective communication in formal settings.

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