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Завтра у Антона будут деньги.

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VERB <= ПАДЕЖ №1

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When we say a verb we always check it against the noun (pronoun) in the form of Nominative case regardless its meaning.

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For instance in the very special Russian model denoting possession “у кого (№2) есть что (№1)” Subject takes the form of Genitive case (падеж №2) and Object of possession is in Nominative (падеж №1). So, in our example the Subject is “Антон” and it’s 3 person singular, Genitive (он, падеж №2), the Object is “деньги” and it’s 3 person plural, Nominative (они, падеж №1). In this case we use the verb in the form of 3 person plural (были) checking it against the word “деньги” and not “Антон” because “деньги” is Nominative and it doesn’t matter that it’s an Object.

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