2A. Are there posters on your walls?
2B. Yes, there are three posters on my walls.
3A. Are there any chairs in your room?
3B Yes, there is one chair in my room.
4A.Is there a plant in your room?
4B No, there is no plant in my room/there are no plants in my room.
5A. Are there any books on your desk?
5B No there are no books on my desk but there are some books on the shelves.
6A. Is there a guitar on your bed?
6B. Yes, there is a red guitar on my bed.
7A. Is there a TV in your room?
7B No there is no TV in my room, however there is a computer in my room.
8A. Is there a table in your kitchen?
8B Yes, there is a table in my kitchen and also six chairs.
9A.Is there a mirror in your bedroom?
9B No there is no mirror in my bedroom but there is one in my bathroom.