Some nouns occur only in the Plural (like English scissors), e.g. часІ 'clock, watch', дљти 'children'. For such nouns the Genitive Singular rule obviously cannot apply, so you use a collective numeral (двће, трће, чљтверо, etc.), with the noun in the Genitive Plural form. The case forms of collective numerals are shown in Numbers and Numerals: Declension
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Тђм бІло двће детљй.
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There were two children there.
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У менї двће часћв.
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I have two watches.
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In the case of the words ребёнок (Sg. only) and дљти (Plur. only), an additional complication needs to be taken into account. Although ребёнок can mean a child or offspring of any age, its primary meaning is 'a young child.' For instance, У неё љсть ребёнок means, unambiguously, 'She has a small child.' The word дљти does not have that connotation, but it does not have a Singular form. Thus, in order to say 'I have one child (or two, three, four children)' without implying his/her/their young age, one has to use the words сІн 'son' or дћчь 'daughter.'
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У неё бџдет ребёнок.
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She is going to have a baby.
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У неё двће мђленьких детљй.
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She has two young children.
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У неё одќн сІн.
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She has one son. (no particular age is implied)
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У неё одќн сІн и двљ дћчери.
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She has one son and two daughters. (no particular age is implied)
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