第2个回答 2009-01-18
There isn't exact dividing time line between any two of them. However, here in America, speaking of them, people usually refer them APPROXIMATELY to:
morning: before noon (12:00pm)
afternoon: 12:00pm -- around 6:00pm
evening: 6:00pm -- 9:00pm
night:9:00pm -- dawn本回答被提问者采纳