Khan Academy
Khan Academy: Irregular Plural Nouns: The Base Plural
Some nouns are exactly the same in both their singular and plural forms. These are them!
Khan Academy
Khan Academy: Irregular Plural Nouns: Mutant Plurals
Some nouns become plural by changing their vowels instead of adding an -s.
Khan Academy
Khan Academy: Irregular Plural Nouns: F to Ves
Identify and use plural nouns whose endings switch from 'f' to 'ves.'
Khan Academy
Khan Academy: Irregular Plural Nouns: Foreign Plurals
Identify nouns borrowed from other languages and their plural forms!
Khan Academy
Khan Academy: Irregular Plural Nouns: En Plurals
A few nouns become plural by adding -en at the end.
Khan Academy
Khan Academy: Irregular Plural Nouns Review
Learn the plurals of some everyday irregular nouns!
Other
K12 Reader: Reading Instruction Rsources: Irregular Plural Nouns
Designed for second and third graders, this resource from K!2 Reader includes the definition of "irregular plural nouns," examples of irregular plural nouns, and a worksheet.