The most effective pronunciation demo shows the same sound three times: yours clearly, the learner's likely version, and the correction between them. Contrast is what makes the difference audible, and a sound nobody can contrast is a sound nobody changes.
Watching a mouth move tells the tongue where to go far faster than any description. Film close, hold the position long enough to see it, and stop narrating over the moment the viewer needs to look.
A wide shot ruins a pronunciation lesson. Move in until the lips and jaw fill most of the frame, light the face from the front, and record audio from a mic near the mouth so the sibilants survive.
Side angles help for sounds made at the back of the mouth, while straight-on angles work for lips and teeth. Cut between the two when a single view hides the movement. The viewer should never have to guess where the sound is made.
Record the error your audience actually makes rather than an exaggerated cartoon version. When a learner hears their own mistake named and replayed, the lesson lands as recognition instead of criticism.
Then correct it in one move, not five. Give the fixed version immediately after the error while the wrong sound is still ringing. Distance between error and fix is where corrections go to die.
Contrast is what makes a sound audible. Play the mistake, then the fix, while the wrong sound is still ringing.
End each demo with a prompt to record one word on their phone and play it back beside yours. Hearing your own voice is the fastest audit a learner can run, and it works better than any score you could assign.
Ask them to send the recording somewhere, a comment, a friend, a language exchange partner. Sound that never leaves the throat never gets corrected, because the speaker cannot hear what they are doing from the inside.
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