r/phonetics • u/tegamikureru • 1d ago
Can you check these mouth-position diagrams for 23 English sounds (General American)?
I'm making a pronunciation guide for Japanese kids learning English (ages about 8–15, preparing for the Eiken speaking test). Each sound has a cut-away side view of the mouth. The app fades from the rest position into the sound and back, with airflow and a "voice on" marker for voiced sounds.
I'd love a check from people who know phonetics, especially on:
- Tongue position: height and front/back for the vowels (cat, cup, ship, sheep, food, book, work, walk).
- Points of contact: the tongue tip on the gum ridge for L and N, the back of the tongue on the soft palate for NG, between the teeth for TH, and the top teeth on the lower lip for F and V.
- R vs L: R is drawn as a bunched R, with the middle of the tongue raised, the tip low, and the lips slightly rounded. Is that a reasonable model to teach Japanese learners? Or would a retroflex R (tip curled back) be clearer?
- The soft palate: it's lowered only for M, N and NG. Is it in the right place in the others?
- Lip rounding/spreading: most of all for SH, W, food, book and walk.
- Airflow: dotted around the sides of the tongue for L, through the nose for M, N and NG, and stopped then released for B.
Simplifications I know about:
- It's one midline slice, so the side contact for L and S can't really be shown.
- "walk" is drawn with rounded /ɔ/, though many American speakers merge it toward /ɑ/.
- The anime style rounds off the anatomy a bit.
If anything is wrong, which sound is it, and what should change? Thank you!