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Irregular Endings – Plural Rules


Irregular Endings

Why are Irregular Endings so difficult, you ask? Well, if you remember all the way back to our very first rule, recall that we were dealing with regular nouns.


We’ve made it to our fifth episode in English plurals! Pat yourself on the back, and gear up for one of the most difficult episodes yet. Why are Irregular Endings so difficult, you ask? Well, if you remember all the way back to our very first rule, recall that we were dealing with regular nouns. That time has passed, and now our focus finally shifts to irregular nouns. These nouns, in a sense, are lawless. The only rule is that there is no rule to them. There is no method you can apply that will make sense, besides memorization.

Many nouns follow irregular patterns; there are no set rules other than to learn them individually!


This rule is weird because it describes those tricky nouns that do away with rules altogether. I have an aching tooth, while she has many aching teeth. While it seems like the rule here would be to change “oo” to “ee”, this doesn’t work for words like book (which becomes books) or food (which usually stays the same, as it can be considered a mass noun). However, this trick does work for the word foot. Foot becomes feet. However, just because it works for a few words, doesn’t mean we can call it a rule!

Here’s another extremely weird plural. You probably know how the word “person” is pluralized. If not, the plural is people. There really is no other word like this one. By that, we mean that the only way to know the plural of “person” is to memorize “people”. Memorizing words like this is so much easier when you see it in natural context. You probably knew the world “people” because it comes up very often in the real world.

Here are the 10 most common irregular noun plurals!


Numbered lists within numbered lists. Isn’t it great? While this isn’t exactly a rule in and of itself, we thought it was important enough to get its own slot. So, here we are with our top ten irregular plurals. Many you’ve probably seen before, like men and women, and some might be new to you. What do they all have in common? They don’t have any rules for forming their plurals! As we’ve said before, the best way to learn these is to read often. The more you challenge yourself, the faster you’ll pick up on these difficult plurals.


Irregular Endings are some of the most difficult plurals, because there is no set way to figure them out. In fact, the best way is to memorize them! Still, we bet you got the hang of it, but if not, you can always go back to reread and study the examples in detail. Why not test your skills with our deck on No Change Endings? FactSumo’s deck is designed with the student in mind: hone your skills, practice your weaknesses, and feel confident in plural endings! FactSumo is here to help with all your studying needs.

Feeling really confident? Good! That means the sixth episode, Greek & Latin Endings, is just a click away! Why don’t you head there now to see what’s in store for you? If you don’t think you’re ready to continue, no pressure! We want you to learn at your own pace. Either way, see you soon on FactSumo!