Общий:
Do the students have English lessons twice a week?
Специальный:
What lesson do they have twice a week?
Вопрос к подлежащему:
Who has English lessons twice a week?
Альтернативный:
Do the students have English lessons twice or once a week?
Разделительный:
The students have English lessons twice a week, don't they?
Общий:
Do the students have English lessons twice a week?
Специальный:
What lesson do they have twice a week?
Вопрос к подлежащему:
Who has English lessons twice a week?
Альтернативный:
Do the students have English lessons twice or once a week?
Разделительный:
The students have English lessons twice a week, don't they?