Question

Подчеркни имена существительные 3-го склонения. Определи падеж. У Сени и Сани в сети сом с усами. Ткет ткач ткани на платки для Тани. В грязи у Олега увязла телега сидеть тут Олегу до самого снега. Свиристель свистит свирелью.

Answer 1

сети (П.п.), ткани (В.п.), грязи (П.п.), свиристель (И.п.), свирелью (Т.п.).

Answer 2

Свиристель - именительный  падеж
свирелью - творительный падеж 

Answer 3

Nouns of the 3rd Declension and Their Cases

In the given sentence, there are several nouns of the 3rd declension. Let's identify them and determine their cases:

1. Сени - This noun is in the nominative case and refers to a type of fishing net. 2. Сани - This noun is in the nominative case and refers to a type of sled. 3. Сети - This noun is in the genitive case and refers to a net. 4. Сом - This noun is in the accusative case and refers to a catfish. 5. Усами - This noun is in the instrumental case and refers to mustaches. 6. Ткач - This noun is in the nominative case and refers to a weaver. 7. Ткани - This noun is in the accusative case and refers to fabric. 8. Платки - This noun is in the accusative case and refers to scarves. 9. Тани - This noun is in the dative case and refers to a person named Tanya. 10. Грязи - This noun is in the prepositional case and refers to mud. 11. Олега - This noun is in the genitive case and refers to a person named Oleg. 12. Телега - This noun is in the nominative case and refers to a cart. 13. Снега - This noun is in the genitive case and refers to snow. 14. Свиристель - This noun is in the nominative case and refers to a bird species called the chiffchaff. 15. Свирелью - This noun is in the instrumental case and refers to a flute.

Please note that the given sentence contains a mix of nouns in different cases, and the declension of nouns can vary depending on their grammatical function in the sentence.