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 blue line, scaled to your voice (it calibrates over your first few takes). Hỏi and ngã are distinct in the North; in Saigon they merge.
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Listen and pick the tone. Hỏi vs ngã and huyền vs nặng are the hard pairs.
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How reviews work
You get up to 10 new phrases a day plus whatever is due. "Got it" pushes a card further out (1, 3, 7, 14, 30 days). "Again" brings it back today. Progress is saved in this browser only.