pencil case is on the desk. The pencil case is on the desk.
desk is behind a blackboard. The desk is behind a blackboard.
teacher is next to the teacher. There is a teacher next to the teacher.
teacher is in the window. The teacher is in the window.
Проверь себя: убедись, что предлоги правильно описывают положение предметов на картинке!
Уровень Эксперт: Попробуй придумать свои предложения с этими предлогами!