Hindi · Pronunciation Guide
bund KUR-naa — the -nd cluster is entirely dental, made with the tongue tip on the teeth.
band karnaa
Both band and kar have short vowels, so the phrase is light until the final -naa, which is the only long syllable. That gives it a quick, clipped run-up and a broad finish.
Listen: बंद करना
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खिड़की बंद कीजिए।
Khiṛkee band keejiye.
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Listen: खिड़की बंद कीजिए।
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"Khiṛkee band keejiye" swaps in the polite imperative keejiye, and khiṛkee itself contains ड़, the retroflex flap, plus an aspirated kh at the front. So the object is phonetically harder than the verb phrase attached to it.
English speakers say "band" exactly as the English word — alveolar, with a fuller vowel and an audible d release. Move both consonants forward onto the teeth, shorten the vowel to a schwa, and keep the release quiet. The k of kar also wants suppressing.