cats, dogs, buses: Three Ways to Pronounce -s (Master Plurals and Third Person at Once)
Everyone knows how to write the plural form by adding -s, but what about when you say it out loud? The ending of cats is a crisp /s/, while dogs becomes a buzzing /z/, and buses adds an extra syllable. These three pronunciations are not random; they follow the exact same logic as the past tense -ed. Once you learn it, it applies to plurals, the third person, and possessives alike, so you will never get stuck pronouncing any word again.
-s/-es Actually Only Has Three Pronunciations
- /ɪz/: Adds an extra syllable, for example, buses, watches.
- /s/: A crisp voiceless /s/, no extra syllable, for example, cats, books.
- /z/: A buzzing voiced /z/, no extra syllable, for example, dogs, goes.
Rule 1: If the word ends in a "hissing sound" → Pronounce it as /ɪz/, which adds an extra syllable
If a word already ends in a hissing sound—specifically s, z, sh, ch, x, ge/dge sounds—adding -s is pronounced as /ɪz/ and adds an extra syllable.
- bus (bus, one syllable) → buses (two syllables)
- kiss (to kiss) → kisses
- watch (watch) → watches
- box (box) → boxes
- orange (orange) → oranges
The reason is exactly the same as with -ed: the original hissing sound is too similar to the subsequent s sound, making them blend together indistinguishably. Therefore, a vowel /ɪ/ is inserted to separate them. This is the only situation that adds an extra syllable, so commit it to memory first.
Rule 2: If the word ends in a voiceless consonant → Pronounce it as /s/
If the word ends in a voiceless consonant (such as p, t, k, f—sounds where your throat does not vibrate when you touch it), -s is pronounced as a crisp /s/.
- cat (cat) → cats
- book (book) → books
- map (map) → maps
- cup (cup) → cups
It does not add an extra syllable; just finish with a crisp sound at the end.
Rule 3: If the word ends in a voiced consonant or vowel → Pronounce it as /z/
If the word ends in a voiced consonant (b, g, d, l, m, n, r...) or a vowel, the -s matches it by becoming voiced, pronounced as /z/.
- dog (dog) → dogs (pronounced as /dɒɡz/, not /dɒks/)
- go (to go) → goes
- play (to play) → plays
- run (to run) → runs
- boy (boy) → boys
The way to tell is also by touching your throat: the g at the end of dog vibrates and is voiced, so -s follows suit and becomes the voiced /z/.
A Simple Truth That Saves You From Memorizing
The trick is exactly the same as with -ed:
Only words ending in a hissing sound (s, z, sh, ch, x, ge) will have -s add an extra syllable (/ɪz/). For all other words, no extra syllable is added; just touch your throat to choose between /s/ and /z/.
If the preceding sound is quiet, use /s/; if the preceding sound vibrates, use /z/. Your tongue will choose naturally.
One Set of Rules, Three Applications
The best part is that these three rules don't just govern plurals; they also apply to two other common types of -s:
- Plurals: cats, dogs, buses
- Third-person singular: she runs, he goes, it watches
- Possessives: Tom's, the dog's tail
Their pronunciations are completely identical, so you are actually getting "three for the price of one."
Two Most Common Habits of Taiwanese Learners
Habit 1: Pronouncing everything as /s/. Pronouncing dogs as /dɒks/—this actually makes two mistakes at once: the -s does not change into /z/, and even the preceding g is devoiced into a k. If you pronounce it smoothly and let the ending vibrate along with the preceding sound, dogs will naturally be /dɒɡz/.
Habit 2: Dropping the -s. Pronouncing three cats as three cat, or she goes as she go—once you drop the ending sound, the plural and third-person indicators disappear, making your grammar sound broken.
- ✓ She likes dogs. (Keep both -s sounds)
- ✗
She like dog(Both ending sounds are dropped)
The trick: the s or z at the end of the word doesn't need to be very loud, but it must be heard.
How to Practice on Loopy
In Loopy's dictionary, tap the pronunciations of cats, dogs, and buses to compare the three endings—/s/, /z/, and /ɪz/—over and over again. The graded courses will put these words into real sentences. Combined with the listening and shadowing feature, you can read aloud and let the system check if the ending sounds of your plurals and third-person verbs are present. Then, use the memory curve reviews to encounter them just when you are about to forget them, allowing good pronunciation habits to gradually develop.
Next time you pronounce any -s, first ask: "Does the word end in a hissing sound?" If yes, add an extra syllable; if no, touch your throat to choose between /s/ and /z/. It is the same trick as -ed—learn it once and use it for a lifetime.