LIGHT
THERE ARE (...) lights (IN the classroom / ON the ceiling)
THERE IS a schoolbag (ON the floor) / THERE ARE (...) schoolbags (IN the classroom)
THERE IS a notebook (ON the desk) / THERE ARE (...) notebooks (IN the schoolbag)
THERE IS a pencil's case (ON the desk / IN the schoolbag)
THERE IS a window / THERE ARE (...) windows (IN the classroom)
THERE IS a book (IN the schoolbag) / THERE ARE (...) books (ON the desk)
THERE IS a pen (ON the desk) / THERE ARE (...) pens (IN the pencil's case)
THERE ARE (...) chairs (IN the classroom)
THERE IS a sharpener (IN the pencil's case / schoolbag)
THERE IS a ruler (ON the desk / IN the schoolbag)
THERE IS a whiteboard (IN the classroom)
THERE ARE (...) colored markers (IN the schoolbag / ON the desk)
THERE IS a blackboard in the classroom
TEACHER'S DESK
THERE IS a teacher's desk (IN the classroom)
THERE IS an eraser (IN the pencil's case / ON the desk)
THERE IS a TV (IN the classroom)
TRASH BIN
THERE IS a trash bin (IN the classroom)
Scissors
THERE IS a pair of scissors (IN the schoolbag / ON the desk)
STUDENT'S DESK
THERE ARE (...) student's desks (IN the classroom)
THERE IS a pencil (IN the case / ON the desk) / THERE ARE (...) pencils (IN the schoolbag)
LAPTOP
THERE IS a laptop (ON teacher's desk / IN the classroom)