Japanese · Pronunciation Guide
mi-n-na, three beats — the n in the middle is a whole beat of humming before the na arrives.
minna
Three morae, and the middle one has no vowel at all. Standard speech puts the accent on the first, so mi is high and the rest fall away. English hears two syllables here and gives two beats; Japanese counts three. The extra time all goes into the sustained nasal in the middle.
Listen: みんな
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みんなで公園に行きます。
Minna de kouen ni ikimasu.
We are all going to the park.
Listen: みんなで公園に行きます。
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みんなで公園に行きます attaches で directly, giving four continuous morae before the noun. 公園 is another four (ko-o-e-n): a long o, then a vowel, then a moraic nasal — three different length phenomena in one word. Between them, the sentence is essentially an exercise in giving vowel-less and vowel-only morae their equal share of time.
"MEE-nah" is the standard English version: two syllables with a stretched first vowel and a single flicked n. That loses an entire mora. The fix is to hold the n audibly — say "min" and then keep humming before you open into "na," so a listener can hear the nasal as a beat in its own right rather than as a consonant belonging to either side.