In German interrogative pronouns (question words) are sometimes called W-Wörter, since they all start with W.
The word order in interrogative sentences in German is similar to that when we make interrogative sentences using the verb to be or to have in English:
You are a teacher – Are you a teacher?
Du bist Lehrer – Bist du Lehrer? (informal, friendly form)
Sie sind Lehrer – Sind Sie Lehrer? (formal, polite form)
The word order in interrogative sentences is:
(question-word + ) verb + subject + other parts of the sentence
Basic questions in German