How to read the curves
Pitch is drawn on the 5-level scale linguists use for tones (1 = your lowest, 5 = your highest). A break in the line means a glottal catch, a short closure in the throat. A bar at the end means the sound is cut off. Press record and your own pitch appears as a dashed red line, scaled to your voice (it calibrates over your first few takes). The wave button hums the tone without the word. Hỏi and ngã are distinct in the North; in Saigon they merge.
Đúng · correct
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Listen, then pick the tone. Hỏi vs ngã and huyền vs nặng are the hard pairs.
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