1. Do they go to work on Sunday? (общий)
Why do they go to work on Sunday? (специальный)
They don't go to work on Sunday, do they? (разделительный)
2. Is it cold today?
What's the weather today?
It is not cold today, is it?
3. Has Ann already begun to read a new book?
Who has already begun to read a new book?
Ann has already begun to read a new book, hasn't she?