German · Pronunciation Guide
gruen — hard g, a throaty r, then a long ü made by saying 'ee' with the lips pushed forward and rounded.
Single syllable, so what matters is vowel length rather than placement — and this ü is long, marked by the single consonant after it. Set it against fünf, where two consonants follow and the same letter is short. Adjective endings leave everything alone: grüne and grünes keep the long vowel under the beat.
Listen: grün
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Das Gras ist grün.
The grass is green.
Listen: Das Gras ist grün.
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Das Gras ist grün lines up two words starting with gr, which lets you hear the r twice in one breath. Gras has a long a and ends in a plain s; grün stays bare with no ending because adjectives after ist never inflect. Both nouns and adjectives here are as simple as German gets, so the sentence is really a vowel-length exercise.
Rounding is the whole battle. English speakers either drop the rounding and produce the English word green, or keep the rounding but pull the tongue back and produce 'groon'. Neither is close enough — German ü needs a forward tongue and rounded lips simultaneously, and the mismatch is instantly audible. Practise by holding a long 'ee' and slowly pursing your lips without letting the tongue slide backwards.