Some verbal stems having a consonant cluster at the end become expanded with a so-called "voyelle de soutien" ы which is dropped before the suffixes beginning with a vowel: кывзы = кывз+ы 'hear', видчы 'swear' = видч+ы, e. g. кывзыны 'to hear', кывзытöн 'by hearing' but кывзі 'I heard', кывзö 'he hears', кывзан 'you hear'.