قواعد اللغة الروسية WikiTranslate
Ученик: Кот любит рыба. Учительница: Wrong. The word order means nothing in Russian but the case endings do. They would not understand you. Кот, as the subject of the sentence, should remain in the nominative case but pыба, as an object, should be in the accusative case pыбу.Only then will your sentence make proper sense to a Russian speaker.