Japanese · Pronunciation Guide
da-re-ka, three even beats — a tap in the middle and a か that isn't a question marker.
dareka
Three slots, evenly cut. Set it beside 誰も (dare mo): identical rhythm, identical first two beats, and only the final mora distinguishes "someone" from "no one." That final beat therefore has to be clear — and it must not be lengthened for emphasis.
Listen: 誰か
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玄関に誰かいます。
Genkan ni dareka imasu.
There's someone at the door.
Listen: 玄関に誰かいます。
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玄関に誰かいます opens with 玄関 (ge-n-ka-n), four morae with two nasal beats, the first coloured by the following k. So the sentence starts with two vowel-less units and then delivers three plain vowel-bearing ones — a full swing between the two kinds of mora.
"DAH-reh-ka" stresses the front and stretches the a. Level all three beats. The bigger issue is the r: an English approximant here rounds the lips and blurs the boundary between re and ka, where a single tap keeps the two beats cleanly separated.