1. Is the man in this room? Who is in this room? Where is the man? The man is in this room, isn't he?
2. Is there an interesting play on tv? What is interesting there on tv? Where is an interesting play? How is the play there on tv? There is an interesting play on tv, isn't there?
3. Do you buy the food in the store? Where do you buy the food? What do you buy in this store?what do you do with the food in this store? You buy the food in this store, don't you?