Japanese · Pronunciation Guide
na-ru, two short beats, ending on a single tongue-tap and completely unrounded lips.
naru
Length is the one thing that must not vary here; the pitch does all the moving, high on na and low on ru. As with 食べる and ある, this is a verb whose ending will change constantly, so building even timing into the base pays dividends across every conjugation you'll meet later.
Listen: なる
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幸せになりたいです。
Shiawase ni naritai desu.
I want to be happy.
Listen: 幸せになりたいです。
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幸せになりたいです conjugates it to なりたい, where the ta-i at the end must stay two beats rather than fusing into "tie." The sentence also gives 幸せ (shi-a-wa-se), four morae with a devoicing-prone shi followed immediately by a bare a — two adjacent vowels that shouldn't merge. Plenty to keep separate in one short line.
"NAH-roo" collects the standard errors: a stretched first vowel, English stress, a curled r, and rounded lips at the end. Aim instead for two brisk equal beats with a single quick flick of the tongue. The lip position is the easiest thing to check in a mirror — if they push forward for the u, you're still speaking English.