Minimal pairs · θ · s
think or sink
The famous th: tongue between the teeth, air over the top. Russian and Latin American Spanish lack it, and many Arabic dialects say s or t.
Hard for Russian, Spanish and Arabic speakers
Press play, then tap the word you heard.
How to teach the mouth
The 'silly snake' drill: tongue peeks out, blow gently. If you can see the tongue in the mirror, the th is real — s hides the tongue completely.