Japanese · Pronunciation Guide
na-na, two identical beats with the same open "ah" both times — no stress on either.
nana
Two morae, identical in every respect except pitch: standard speech gives this a fall after the first, so the opening na is high and the second drops. Length and loudness, though, stay matched. A word made of the same mora twice is a perfect diagnostic — if the two halves sound different in anything but pitch, English rhythm is intruding.
Listen: 七
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友達が七人来ます。
Tomodachi ga shichi-nin kimasu.
Seven friends are coming.
Listen: 友達が七人来ます。
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友達が七人来ます actually uses the alternative reading: 七人 is read shichi-nin, not nana-nin. That's worth noticing rather than glossing over — Japanese keeps two readings for seven, and counters select between them. Say the sentence as shi-chi-nin (three morae) and note that the shi there is prone to devoicing between voiceless sounds.
The standard error is "NAH-na," giving the first syllable English primary stress and reducing the second toward a schwa, as in the name "Hannah." Japanese requires two full, identical a vowels. Also resist stretching either one: both beats are short, and the word should feel almost too quick to have two syllables in it.