经典伤感英文语句？

f you are hapy,you must know the person who is sad.如果你快乐，你必须知道谁是悲伤的人。if you are not hapy,you must know the person who is hapy.如果你不快乐，你必须知道是谁是快乐的。if you are hapy,you must know the person who is sad.如果你快乐，必须知道是谁在悲伤。if you are not hapy,you must know the person who is hapy.如果你不快乐，你必须知道是谁在快乐。if you are not hapy,you must know the person who is sad.如果你不快乐，你必须知道是谁在哭泣。if you are hapy,you must know the person who is sad.如果你不快乐，你必须知道是谁在哭泣。if you are hapy,you must know the person who is hapy.如果你不快乐，你必须知道是谁在快乐。if you are hapy,you must know the person who is sad.如果你不快乐，必须知道是谁在悲伤。