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The -ed and -s endings

grammatical endings · syllable structure

These two endings are not a pronunciation problem, they are a grammar problem. Lose the ending and He walked becomes He walk, three cats becomes three cat. And each of them is read three different ways, depending on whether the sound before it is voiced.

1

Why this happens

the mechanismGet another sound wrong and you have an accent. Get these two wrong and the listener concludes your grammar is weak — because English tense and plurality hang on that one sound. They are also the hardest to say: -ed creates a final cluster (walked = /wɔːkt/) and -s fuses with the consonant before it (books = /bʊks/). A language that does not allow final clusters makes two mistakes at once here: the sound disappears, and the grammar disappears with it.
2

The two opposite habits

Dropping the endingand the grammar goes with it

He walked → He walk / three cats → three cat

This is syllable structure at work: -ed creates a final cluster (walked = /wɔːkt/) and a language that does not allow final clusters simply leaves it out. The trouble is that English hangs tense and plurality on that one sound. The listener does not hear a pronunciation problem, they hear the wrong tense.

Adding a syllablethinking it sounds clearer

walked → walk-ed / /ɪd/ only after t, d

The -ed is given a syllable of its own. It sounds clearer, but English only has /ɪd/ after t and d. Walked is one syllable, walk-ed is two, and a native speaker hears the difference immediately.

3

What to do

A self-test: feel your throatPut your hand on your throat and say the base word. If it vibrates, the ending is /d/ or /z/; if it does not, the ending is /t/ or /s/. That settles most cases. The rest are /ɪd/ after t or d and /ɪz/ after a sibilant — and those you can hear, because they add a syllable.
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Words to practise

tap a word to hear it; the small + saves just that word

The three readings of -ed

Same set of words, different last sound, different ending. Played one after another the contrast is obvious.

The three readings of -s

Exactly parallel to the list above — learn them as a pair.

5

The three readings

-edHow -ed is read: by the last sound, not the last letter
/t/

after a voiceless consonant (p k f s ʃ tʃ)

the vocal cords are not vibrating, so the ending is voiceless too

/d/

after a voiced consonant or a vowel

the vocal cords are vibrating, so the ending is voiced

/ɪd/

after t or d

two t's or two d's cannot be told apart — one more syllable is the only way to hear the ending

★ The test is whether the sound before it is voiceless or voiced — not how the word is spelled. That is why laughed ends in /t/ (the last sound is /f/) while played ends in /d/ (the last sound is a vowel).

-sHow -s is read: exactly the same logic
/s/

after a voiceless consonant (p t k f)

voiceless + voiceless

/z/

after a voiced consonant or a vowel

voiced + voiced. ★ this is the one most often said with /s/ by mistake

/ɪz/

after a sibilant (s z ʃ ʒ tʃ dʒ)

two sibilants run together into mush — they have to be separated

Here -s covers plurals, third-person verbs and possessives. The rule runs parallel to -ed: /s/ after a voiceless sound, /z/ after a voiced one, /ɪz/ after a sibilant.

6

A detail that goes against intuition

The counter-intuitive part: /ɪd/ is not clarity, it is an extra syllableMany learners say walked as walk-ed, believing they are being clear. They are adding a whole syllable: walked is one syllable, walk-ed is two. English only has /ɪd/ after t and d; anywhere else it is simply wrong. The test is not “does it sound clear”, it is is the syllable count right.
7

In a real sentence

He walked to work, watched three cats, and washed two dishes.

Tap an underlined phrase to start from there.

Five endings in this sentence: four voiceless, one with an extra syllable. No exceptions.

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