Ответ:
1. Sunday is a very quiet day in London.
Is Sunday a very quiet day in London? (Общий)
When is a very quiet day in London? (Специальный)
Is a very quiet day in London on Saturday or Sunday? (Альтернативный)
Sunday is a very quiet day in London, isn't it? (Разделительный)
2. They clean windows on Saturday afternoon.
Do they clean on Saturday afternoon? (Общий)
When do they clean windows? (Специальный)
Do they clean windows on Saturday or Monday? (Альтернативный)
They clean windows on Saturday afternoon, don't they? (Разделительный)