16.
3. There aren't any children in the room.
4. There isn't a coffee table in front of the armchair.
5. There isn't a cupboard next to the fridge.
6. There aren't any women in the room.
7. There aren't any books on the shelves.
8. There isn't a tree behind the house.
17.
3. Is there an armchair in the living room? - Yes, there is.
4. Are there any apples in the fridge? - No, there aren't.
5. Are there any cups in the cupboard? - No, there aren't.
6. Is there a sofa in the bedroom? - No, there isn't.
7. Are there any flowers in front of the house? - Yes, there are.