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Most plural nouns are formed by adding -s, but some plural nouns are irregular. Example: The wives have many scarves. Explanation: Wives and scarves are irregular plural nouns because they are not formed by simply adding -s to the end of the singular noun. Here are some rules to follow to form irregular plural nouns: If the noun ends with -fe, change the ‘f’ to ‘v’ and then add -s: knife → knives If the noun ends with -f, change the ‘f’ to ‘v’ and then add -es: wolf → wolves If the noun ends with -o, add -es: potato → potatoes If the noun ends with -us, change the -us to -i: cactus → cacti If the noun ends with -is, change the -is to -es: analysis → analyses If the noun ends with -on, change the -on to -a: phenomenon → phenomena Some irregular plural nouns do not follow any of these rules. Sometimes, we change the vowel: foot → feet Other times, we add a different ending: child → children Sometimes, we change the word altogether: person → peopleUse
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For some nouns, the singular and plural versions are the same.