01:16 Dec 12, 2009 

Это получается тем англофонам, которые часто говорят/пишут о гривне, надо учить эти правила?

The nominative plural of hryvnia is hryvni (Ukrainian: гривні). This is also the genitive singular of hryvnia, while the genitive plural is hryven′ (Ukrainian: гривень). In Ukrainian, the genitive singular form is used for numbers ending with 2, 3, or 4, as in dvi hryvni (дві гривні, "2 hryvni"), and the genitive plural is used for numbers ending with 5 to 9 and 0, for example sto hryven’ (сто гривень, "100 hryven’"); for numbers ending with 1 the nominative singular form is used, for example dvadtsiat' odna hryvnia (двадцять одна гривня, "21 hryvnia").