For "to be" in the present tense:
* For singular: "je" (pronounced "ye")
* For plural: "su" (pronounced "soo")
For "are you" as a question:
* Informal: "Da li si?" (pronounced "Da li see?")
* Formal: "Da li ste?" (pronounced "Da li ste?")
Examples:
* "He is happy." - "On je srećan."
* "They are students." - "Oni su studenti."
* "Are you coming?" - "Da li si dolaziš?"
* "Are you coming?" (formal) - "Da li ste dolazite?"
It's important to note that Serbian has a more complex grammatical structure than English, so the exact translation of "are" will depend on the context and the subject of the sentence.