это просто. Нужно составить диалог с пятью репликами.
Вот, например:
Phil: why did you come home so late yesterday?
Jane: I had been to the library
Phil: were you hungry?
Jane:Certainly. When I came back, I was tired and hungry - I had been working for 3 hours.
Phil: What had you been doing in the library?
Jane:I just tried to find out some information from the books.
Phil: Why do you need this informstion?
Jane:I had the hometask in biology.
Phil:Can you show it to me?
Jane:Sure, but not right now, I have yo go. Goodbye!
Phil:Bye.