Questions & Answers about Çift parkta çay içiyor.
Turkish marks a specific/definite direct object with the accusative ending.
- çay (no ending) = tea in a general/indefinite sense: “drinking tea.”
- çayı (accusative) = the specific tea: “drinking the tea.”
So Çift parkta çay içiyor = “The couple is drinking tea (some tea).”
If you mean “the tea (we both know about),” say Çift parkta çayı içiyor.