空だ
The classroom is empty.
教室が空いています
The classroom is empty because of the holiday.
休みなので教室が空いています
The classroom has been empty since this morning because of the holiday.
休みなので今朝から教室が空いています
Our school's classroom has been empty since this morning because of the holiday.
休みなので今朝から私たちの学校の教室が空いています
Our school's classroom is still empty from this morning because of the holiday.
休みなので今朝から私たちの学校の教室がまだ空いています