Change the sentences from active to passive voice the main gate of the building is closed at 9:00 p.m. all the houses wearing tharali search by the police a new air conditioned auditorium is being built by the management the file had been cleared by the principle by 5:00 p.m. by next year all classrooms will have been treated with smart board when will the election result be announce how many medals won by India in the last olympic