помогите выполнить задание нечего не пойму

2how often do you meet your friends?
3who is singing now?
4I answered all your questions yesterday.
5I will(shall) write a letter tomorrow.
6what are you looking at?
7did you work in the garden last summer?
8Tim often plays football at the weekend.
9Pete took my book last week.
10are you listening to me now?