Как я понимаю, вместо sun должно быть son, а то бессмыслица получается...
1)What does she buy for her sun at the market in autumn?
2)To whom does she buy sweet apples at the market at autumn?
3)Where does she but sweet apples for her son?
4)When does she buy apples for her son?
5)Why does she buy sweet apples for her son?
6)She buys apples for her son at the market, doesn't she?
7)She buys sweet apples for her son at autumn, doesn't she?
8)Who does buy sweet apples for him?
9)What kind of apples does she buy for her son?
10)Does she buy sweet apples for her son at the market?
Как-то так, наверное...

She buys sweet apples for her son at the market at autumn.


Does she buy sweet apples for her son at the market in autumn?
She buys apples for her son at the market, doesn't she?
Does she buy sweet apples for her son or daughter at the market?
Does she buy sweet apples or pears for her son at the market?
Why does she buy sweet apples for her son?
What does she buy for her son at the market in autumn?
Where does she buy sweet apples for her son?
When does she buy apples for her son?
What kind of apples does she buy for her son?
Who buys sweet apples for her son at the market in autumn?
Who does she buy sweet apples to?