English /ð/ vs /d/
they vs day: tongue between teeth, or pressed behind them?

Both /ð/ and /d/ are voiced sounds made in roughly the same part of the mouth. The difference is one physical gesture: for /ð/, air flows continuously past the tongue tip near the teeth. For /d/, the tongue blocks airflow completely then releases it. That single difference -- fricative vs stop -- is what separates "they" from "day," "this" from "dis," and "though" from "dough."

The ABX drill plays two reference sounds then a mystery sound X. Pick which one X matches. Five rounds is enough to start building a real perceptual gap.

💨Fricative vs stop
🔊Both voiced sounds
👄Same place in mouth
⚠️Very common ESL mistake
Can you hear the difference?
How it works: You'll hear sound A, sound B, then a mystery sound X. Choose whether X matches A or B. Words are revealed after you answer.
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Listen carefully...

Mystery sound

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The problem

Why /ð/ gets replaced by /d/ in almost every accent

The voiced dental fricative /ð/ appears in fewer than 10% of the world's languages. English and Modern Greek are the main examples. When speakers of essentially any other language encounter /ð/, they map it to the closest voiced sound they do have -- and that is almost always /d/.

The confusion is reinforced by how /ð/ appears in spelling. In English, "th" can be either voiceless /θ/ (as in "think") or voiced /ð/ (as in "this"), with no consistent rule. The same letters, two different sounds. Learners who already struggle with one TH sound now have to distinguish two.

The words affected most are function words -- the, this, that, they, them, then, there, though, with, brother, mother, father -- that appear in virtually every sentence in English. If /ð/ gets replaced by /d/ in these words, it affects comprehension constantly.

What happens without training
  • ✗ "They went home" sounds like "Day went home"
  • ✗ "This is mine" sounds like "Dis is mine"
  • ✗ "Though it's hard" sounds like "Dough it's hard"
  • ✗ "My father" sounds like "My fader"
  • ✗ "Breathe in" sounds like "Breed in"
What changes with ear training
  • ✓ You start catching the airflow difference
  • ✓ /ð/ and /d/ stop collapsing into one category
  • ✓ The most common English words sound clearer
  • ✓ Your production of "the," "this," "they" improves naturally
Spanish speakers

Spanish has /d/ but no /ð/ as a separate phoneme. Some dialects soften /d/ between vowels toward a /ð/-like sound, but it is not phonemically distinct. Spanish learners of English almost universally replace /ð/ with /d/.

French speakers

French has neither /ð/ nor /θ/. French learners typically substitute /d/ or occasionally /z/ for /ð/. The voiced dental fricative is entirely absent from French phonology.

Mandarin / Japanese speakers

Neither Mandarin nor Japanese has dental fricatives. Mandarin speakers often use /d/ as a substitute; Japanese speakers may use a similar stop. Both groups find /ð/ one of the harder English consonants to acquire.

Production guide

How to produce /ð/ and /d/

/ð/voiced th -- they, this, breathe
  1. 1. Place the tip of your tongue lightly between or just behind your front teeth.
  2. 2. Vibrate your vocal cords -- you should feel buzzing in your throat.
  3. 3. Let air flow continuously past the tongue tip. Do not block or stop it.
  4. 4. You should feel a slight buzzing on the tongue tip where it contacts the teeth.
Anchor words: the, this, that, they, them, then, there, though, with, breathe, bathe, smooth, mother, father, brother
/d/d -- dog, day, door, dark
  1. 1. Press the tongue tip firmly against the alveolar ridge just behind the upper teeth.
  2. 2. Build air pressure behind the tongue seal -- airflow is completely blocked.
  3. 3. Vibrate your vocal cords, then release the tongue quickly to let the air burst out.
  4. 4. The burst is the sound -- there is no sustained airflow like in /ð/.
Anchor words: dog, day, door, dark, dance, dad, desk, deep, did, done, down, drink, drive, date
The buzz test

Place two fingers lightly on your throat. Say a long "zzzzz" sound -- you'll feel vibration. Now make /ð/ by moving your tongue tip to the teeth while keeping that vibration going. The continuous buzz with tongue-to-teeth is /ð/. If the buzz stops abruptly and restarts, you made /d/.

The airflow test

Hold a thin piece of paper in front of your mouth. Say "they" then "day." For "they," the paper should flutter slightly and continuously on the /ð/. For "day," you should feel a tiny puff of air burst on the /d/ -- a brief pulse, not a stream. That puff vs stream is the physical distinction.

Click to hear

Minimal pairs: tap each word to hear it

English word pairs where the only difference is /ð/ vs /d/. Click each word to compare.

/ð/ voiced th
/d/
third person plural pronoun
↔
a 24-hour period
despite the fact that
↔
unbaked bread mixture
demonstrative pronoun
↔
informal spelling
at that time
↔
a small private room
in that place
↔
to challenge someone
More /ð/ words
thethisthattheythemthentherethoughwithbreathebathesmoothmotherfatherbrother
More /d/ words
dogdiddaydaddoordarkdancedeskdeepdatedonedowndrinkdrive
Common questions

Frequently asked

Explore more guides

English Minimal PairsAll English sound contrast guides/ð/ vs /z/breathe vs breeze, with vs whiz

/ð/ vs /d/ is just one English contrast

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