Is hij jouw vriend? Ja, hij is.
English: Is he your friend? Yes, he is.
Short answers in Dutch repeat the helper verb from the question, similar to English.
Use short answers to respond naturally without repeating full sentences.
Is hij jouw vriend? Ja, hij is.
English: Is he your friend? Yes, he is.
Houd je van koffie? Nee, ik doe niet.
English: Do you like coffee? No, I do not.
Zijn zij thuis? Ja, zij zijn.
English: Are they at home? Yes, they are.
Studeert zij hier? Nee, zij studeert niet.
English: Does she study here? No, she does not.