Hindi · Pronunciation Guide
LAY-naa with a clear front l and a long flat e that does not glide upward.
lenaa
Nothing complicates the rhythm here: two long vowels, no clusters, no aspiration, no retroflexion anywhere. That makes it a good word for concentrating purely on vowel length and on keeping both vowels free of English glides.
Listen: लेना
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मैं एक कॉफ़ी लूँगा।
Maiṁ ek kofee looṁgaa.
I will have a coffee.
Listen: मैं एक कॉफ़ी लूँगा।
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"Maiṁ ek kofee looṁgaa" replaces the infinitive with the masculine future looṁgaa, whose nasalized ooṁ is the first-person marker. That form looks nothing like lenaa on the page, which is why hearing the shared l is useful.
The diphthong is the problem: English speakers say "LAY-ee-nuh," gliding the first vowel and reducing the second. Hold the e in one position and give the final aa its full length. A dark l would also drag the word backwards, so keep the tongue tip forward.