Why I Spent 40 Hours Researching the Suffix -ED so You Wouldn’t Have To
I knew that pronouncing the -ed suffix for regular verbs in the past tense was hard for my adult students. They had certain “fossilized” errors that were going to be hard to break. Many of them had spent years making the same mistakes.
I had developed a compact table and practice sheet but I really didn’t have answers to all their questions.
Standing in front of my business English class, someone asks: “Why is ‘worked’ pronounced with a /t/ but ‘wanted’ has an extra syllable?” I’d give the standard textbook answer, “It makes pronunciation easier,” but deep down, I felt I should know the real answer.
My Struggle (The “Soul Searching”): Recently, I decided to stop “winging it” with the past tense. I’ll be honest: I got lost in the details. I spent weeks spiraling into the “why” behind the -ed suffix. I went down rabbit holes of linguistic history and Old English phonology. I was searching, as usual, for a way to make lessons appear “logical”, and, therefore, easy to remember for my students who were bright, young, professionals (and often times engineers).
The “Ah-Ha” Moments (What I Learned): In my quest to build the perfect lesson, I discovered things that changed how I would teach -ed pronunciation:
- The 3% Rule: We spend months on irregular verb charts, yet only 3% of English verbs are irregular. The other 97%—including every new verb entering the English language, follows the -ed rule. It was so reassuring to learn when an emerging technology creates a new verb (Tiktoked, Googled, Slacked) my students would know it’s going to be a regular verb.
- The Survival of Irregulars: Why didn’t “run” become “runned”? Because common verbs were used so often that our ancestors’ brains “locked them in,” while rarer verbs evolved to follow the easier -ed pattern. That’s why the top 10 most common verbs are all irregular (be, have, do, say, get, make, go, know, take, come).
- The Chin-Drop Secret: I learned that counting syllables isn’t just about hearing; it’s about feeling. If your chin doesn’t drop, you haven’t added a syllable. Instead of clapping out the syllables of a word, just place your outstretched hand (palm side down) under your chin and count the number of times your chin drops.
- The Vocal Engine: I spent hours touching my own throat, locating the exact vibration of “voiced” vs. “voiceless” sounds until I could explain it to a student in five seconds.
- Why three sounds for -ed: The reason behind our modern pronunciation rules for -ed is a classic case of language taking the “path of least resistance.” It’s rooted in a linguistic process called assimilation, which evolved as Old English transitioned into Middle and Modern English. Historically, the -ed suffix was its own distinct syllable (pronounced similar to “ed” in “bed”). Over centuries, speakers began dropping that middle vowel sound to speak faster. I call it the “lazy man’s rule”. If the base verb ends in a “voiced” consonant, the -ed ending is pronounced [d]. Likewise, if the base verb ends in a “voiceless” consonant, the -ed is pronounced [t].
- The CVC Spelling Rule: Why do we double the consonant before adding -ed or -ing? This spelling rule is all about pronunciation, about protecting the pronunciation of the base verb. If we double the last consonant before adding the suffix, the short vowel sound is protected. I had been teaching the whole story of long and short vowels, but realized that it was overly complicated. The CVC rule is much simpler to teach.
The Solution: I realized that if I was this overwhelmed by the complexity, other teachers definitely were too. I took all that research—the CVC spelling rules, the Old English history, the “Vocal Engine” mechanics—and distilled it into a single slide deck with activities.
I started out with my reliable standby, a simple -ed Pronunciation Chart that I’d been using for years. But it needed an update.
How I updated my -ed cheatsheet
1) I decided to reorganize the three columns and slide the easiest pronunciation [id] column over to the left.
2) I added the terms “voiced” to the [d] column and “voiceless” to the [t] column, just like all the other pronunciation tables I’d seen, even though I barely knew what those terms meant and even less how to explain them. I’d worry about that latter.
3) I decided to list the verbs in each column according to the final consonant rather than in alphabetical order. I was thinking how my students would “look up” a verb. How would they learn best? Grouping like items is logical and will be easier for students to practice.
4) The term “infinitive” was dropped, and “base verb” was chosen as more modern. I developed a system of symbols. To designate pronunciation. I used slash marks /d/ or sometimes square brackets [d]. The bullet point designated the final -ed syllable Ex: atten·ded [did] or expor·ted[tid]. Quotation marks symbolized spelling and not sounds (not pronunciation).
Check out my newly updated regular verb chart
The four changes that I explained above are numbered in red in this photo as a reference.
I updated the practice sheet as well using the same system of symbols. Bullet points signal final syllable. In parenthesise signal a pronunciation change to a letter.
Download the updated tables for free
I decided to add these tables to my TeachersPayTeachers.com store as a “fluency freebie”. To my surprise, over 500 teachers have downloaded it! It turns out, I wasn’t the only one looking for a better way.
Love the freebie? Upgrade to the Master Class for $3
I’ve spent the last few weeks turning that research into a full Masterclass Bundle. I did the soul-searching so you don’t have to.
If you want to skip the 40 hours of research and go straight to the “Ah-Ha” moments with your students, I’ve put everything—the 15 lesson slides, the storytelling activities, the flashcards, and even a self-grading quiz—into one neat package.
Check out the -ED Pronunciation Masterclass on TpT for $3
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I hope you will use this post in your business English classes as well as your TOEIC preparation classes. Leave a comment if you liked this post. Sign up for the newsletter if you want to receive more posts.
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For more tips on improving fluency with business English vocabulary, check out these two posts.
https://www.businessenglishallure.com/verb-tense-activity-guaranteed-improve-speaking-skills/
