German · Pronunciation Guide
NOY, rhyming with English boy. The letters eu always say 'oy'.
The diphthong owns the word — there is nothing else in it. When adjective endings arrive the extra syllables are unstressed schwas: neue, neues and neuen all keep the beat on the diphthong and let the ending fade away behind it.
Listen: neu
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Ich habe ein neues Auto.
I have a new car.
Listen: Ich habe ein neues Auto.
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Ich habe ein neues Auto shows the adjective doing gender work the article cannot. Ein gives away nothing about whether the noun is masculine or neuter, so neues has to carry the -es that marks Auto as neuter. The noun itself begins with a glottal catch and the 'ow' diphthong.
The pull toward English new is strong, and it produces 'nyoo' — wrong vowel, and with a y-glide German does not have. Say boy and take off the b. It is also worth keeping this word distinct from neun, meaning nine: they share the diphthong and differ only in the final n, so a mumbled ending can turn new into a number.