🔁 English Irregular Plurals: Patterns and forms (Part 2 of 4)
Learn why some English plurals change their vowels instead of adding -s, and master these historical exceptions that every English learner needs to know.
🎯 Level: Advanced ⏱ Time: 45 minutes 📘 Category: Grammar
📚 Adding S or ES to O Endings
Common Words Requiring -ES
Here’s your guide to mastering those tricky plural forms that end in “-o.” In many cases, nouns ending in -o simply add -s, but there is an important group of common words that require -es instead. Learning these will help you sound more accurate and confident in English. Let’s break it down! 🚀
When “-ES” Is Required: Common Words
Some frequently used words ending in -o always form their plural with -es. Think of these as high-priority words—once you know them, you’ll avoid a lot of common mistakes.
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- Hero → heroes 🦸
- Potato → potatoes 🥔
- Tomato → tomatoes 🍅
- Echo → echoes 🗣️
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- Torpedo → torpedoes 🚀
- Mango → mangoes 🥭
- Cargo → cargoes 📦
Why “-ES”? A Bit of History 🤔
The use of -es with these words has historical reasons. Many of them entered English from other languages, such as Spanish, where -es is a common plural ending. Over time, this pattern became fixed in English for these specific nouns. Language change isn’t always logical—but it is fascinating!
Mnemonics to the Rescue! 💡
Remembering lists can be challenging, so mnemonics can really help. Try making a playful sentence that includes all the words, for example:
“The heroes ate tomatoes and mangoes while dodging torpedoes and listening to echoes from the cargoes of potatoes.”
The more memorable (or silly) the sentence, the better it will stick! 😂
Practice Makes Perfect 💪
The best way to master these plurals is by using them regularly. Write your own sentences and look for these words when reading or listening to English. With enough exposure, choosing -es will start to feel automatic. Keep practicing—you’re on the right path! 🎉
📚 Musical terms requiring only S
Pluralizing Musical Terms: The Simple “S” Rule 🎶
When you talk about more than one musical term, you’ll often find that adding a simple “-s” is all you need. This is one of the easiest pluralization rules in English, and it applies to many common words. Let’s look at some examples so you can use this rule with confidence.
Common Musical Terms That Take Only “S” 🎼
Many musical terms, especially those borrowed from Italian, follow this straightforward pattern. For example, the plural of piano is pianos. In the same way, solo becomes solos, and cello changes to cellos. No extra letters—just add -s.
Here are a few more examples to make the pattern clear:
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- Radio → Radios
- Studio → Studios
- Concerto → Concertos
- Tempo → Tempos
Why Only “S” for These Terms? 🤔
These musical terms usually take only -s because of how they were absorbed into English. Many of them are used very frequently, and over time they adopted the simplest plural form. In everyday language, ease and consistency often win out.
Exceptions and Considerations ⚠️
Although many musical terms follow this rule, it’s still helpful to stay alert for exceptions. Some words may have alternative plural forms or follow different rules depending on their origin. That said, for most common musical terms, adding -s is the correct and natural choice.
Practice Makes Perfect! 🎤
To really master this rule, try pluralizing a few musical or related terms on your own, such as banjo, photo, or dynamo. You’ll notice that adding -s feels natural and sounds right. Keep practicing, and pluralization will soon feel effortless. You’re doing great! 🎉
📚 Words ending in O that accept both forms
Words Ending in O: A Plural Adventure! 🎉
Did you know that some words ending in “o” are surprisingly flexible? In certain cases, you can form the plural by adding either -s or -es. Think of it as having two correct paths to the same result. Let’s explore how this works in English.
The “-S” Route: A Simple Choice 🛤️
For some nouns ending in -o, adding just -s is completely correct. This often happens with abbreviations or words connected to music and modern usage. It’s the most direct and simple option.
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- Photo → Photos 📸
- Piano → Pianos 🎹
- Dynamo → Dynamos ⚙️
The “-ES” Path: A Traditional Twist 🏛️
Other words ending in -o traditionally take -es in the plural. These forms are often more established and are taught as fixed plurals. You’ll see them frequently in both spoken and written English.
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- Potato → Potatoes 🥔
- Tomato → Tomatoes 🍅
- Hero → Heroes 🦸
- Echo → Echoes 🗣️
The Best of Both Worlds: Flexibility Rules! 🤸
Here’s where English gets especially interesting. Some words ending in -o allow both plural forms, and both are considered correct. You can choose the form you prefer.
Navigating the Options: A Helpful Guide 🧭
So how do you know which plural to use? There’s no single rule, but these tips can help:
- Mosquito → Mosquitoes / Mosquitos
- Volcano → Volcanoes / Volcanos
- Tornado → Tornadoes / Tornados
- Buffalo → Buffaloes / Buffalos
- Check a dictionary: It will show you which forms are acceptable.
- Notice common usage: Pay attention to what you hear and read most often.
- Be consistent: Choose one form and stick with it within the same text.
- Notice common usage: Pay attention to what you hear and read most often.
English is constantly evolving, and these flexible -o endings are a great example of that. Enjoy the variety and don’t be afraid to use your options! 🥳
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English Irregular Plurals: Patterns and Forms (part 1 of 4) © 2025 by Joe Ehman is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
