Задайте вопросы к ответам.
Например:
1)No, they are not having dinner now. (Are...?)
Are they having dinner now?
2)We are playing tennis now. (What...?)
3)Yes, my mother is doing the shopping now. (Is...?)
4)No, it is not raining. (Is...?)
5)Sam is building a house. (What...?)
6)Ann is looking at him. (Who...?)
7)The birds are flying to the South. (Where...?)
8)Yes, I am eating a cake. (Are...?)
9)I am reading a book.It is very interesting. (Why...?)