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