1) Основной вопрос - Does my sister help's mom about the house?
Специальные вопросы - 1. Who help's mom about the house?
2. About what my sister help's mom?
3. Why my sister help's mom about the house?
2) Основной вопрос - Are children playing in the park now?
Специальные вопросы - 1. Who are playing in the park now?
2. Where children are playing now?
3. Why children are playing in the park now?