| 1 | There is a bookcase at the back of the classroom. | |
| 2 | May I have one of these bookcase? | |
| 3 | What's in your classroom? There's a bookcase. There are some blackboards. | |
| 4 | He crammed all his books into the small bookcase. | |
| 5 | Tall bookcases occupy a lot of space in his room . |