8.3: On prononce
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Native English speakers often have problems differentiating between [e]-[ɛ], [ø]-[œ], and [o]-[ɔ]. The main distinction to be made here is that the first vowel of each of these pairs is more closed than the second, meaning that the mouth is not as open.
Furthermore, when compared to similar vowel sounds of English, the French vowel is always pure and constant.