Ответ:
3 There are some pens on the teacher's desk.
There aren't any pens on the teacher's desk.
4 There's a table near the door.
There's not a table near the door.
5 There aren't any plants near the window.
There are some plants near the window.
6 There are some shelves near the board.
There aren't any shelves near the board.
7 There's a bin near the desk.
There's not a bin near the desk.