We usually have three classes a day. задать все виды вопросов к этому предложению.

We usually have three classes a day,don’t we? Разделительный

Do we (you) usually have three classes a day? Общий

Who usually has  three classes a day? Вопрос к подлежащему

How often do we( you)  have three classes a day? Специальный

Do we( you) have three or four classes a day? Альтернативный