• ahead of time -later than was expected e.g.) We finished 15 minutes ahead of time. 우리는 예정보다 15분 빨리 끝냈다 • behind time -later than was expected e.g.) The plane took off an hour behind time. 그 비행기는 한 시간 늦게 이륙했다. (= The plane took off an hour late.) • on schedule / on time e.g.) Filming began on schedule. 촬영은 일정대로 시작되었다. The project is moving right on schedule, so you have nothing to worry about. ..