The vowels ǒ, yǒ, and ǔ are pronounced with a tight smile; o, yo, u, and yu are said with pursed lips.
Izrunājot [ŏ], [jŏ] un [ŭ], lūpu kaktiņi ir pastiepti uz sāniem; izrunājot [o], [jo], [ū] un [jū], lūpas ir pastieptas uz priekšu un apaļotas.