1-предложения с buy:
+ I bought new ball last month.
- I didn't buy new ball last month.
? Did you buy new ball last month?
2-предложения с eat:
+ I ate apples last morning.
- I didn't eat apples last morning.
? Did you eat apples last morning?
3-предложения с dance:
+ She danced in the park last evening.
- She didn't dance in the park last evening.
? Did she dance in the park last evening?