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1.I seldom write letters.
- Do I seldom write letters? (общий)
- I seldom write letters, don't I? (хвостовой)
- Do I seldom or often write letters? (разделительный)
- What do I seldom write? (специальные)
How often do I write letters?
Why do I seldom write letters?
- Who seldom writes letters? (вопрос к подлежащему)
- I wonder why I seldom write letters. (косвенный вопрос - ?в косвенной речи)
2. my brother doesn't often get good marks.
- Does my brother often get good marks?
- My brother doesn't often get good marks, does he?
- Does my brother often or seldom get good marks?
- What doesn't my brother often get?
Why doesn't my brother often get good marks?
- Who doesn't often get good marks?
- I would like to know why my brother doesn't often get good marks.
3. these books don't usualy cost much.
- Do these books usually cost much?
- These books don't usually cost much, do they?
- Do these books usually cost much or little?
- How much do these books usually cost?
- I want to know how much these books usually cost.
4. they do not bring textbooks.
- Do they bring textbooks?
- They don't bring textbooks, do they?
- Don't they bring textbooks or exercise-books?
- What don't they bring?
Why don't they bring textbooks?
- Who doesn't bring textbooks?
- I wonder why they don't bring textbooks.

Do you often write letters?
Your brother often gets good grades?
These books are expensive?
They bring books?

How often you write letters?