Japanese · Pronunciation Guide
o-shi-e-ru, four even beats — the shi and the e are separate morae, never "shyeh."
oshieru
Four slots of identical size, with the melody peaking mid-word. The critical span is shi-e: two vowels in adjacent morae that English wants to bind with a glide. Keep them as two separate pulses and the word's four-beat shape survives; fuse them and it collapses to three.
Listen: 教える
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駅の場所を教えてください。
Eki no basho o oshiete kudasai.
Please tell me where the station is.
Listen: 駅の場所を教えてください。
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駅の場所を教えてください uses the te-form 教えて and stacks it before ください. That gives a long run of morae with no consonant clusters and no length marks — o-shi-e-te-ku-da-sa-i, eight even beats — which is exactly the kind of stretch where English speakers unconsciously accelerate. Keep the tempo flat all the way to the end.
The usual result is "o-SHYE-roo": the shi and e fused, a stress peak, and an English r. That fusion loses a whole mora. Say "o - shi - e - ru" as four deliberate pulses, then speed up while keeping four. Also resist rounding the final u, which is the most persistent English habit in verb endings.