grieve: implies actual mental suffering, whether it is shown outwardly or not and connotes the concentration of one's mind on one's loss, trouble, or cause of distress: still ~s for his dead child.      trouble和distress这里都表示苦难


mourn: stresses the outward expression of grief, sincere or conventional, and usually suggests a specific cause such as the death of someone loved or respected: a nation ~s the loss of its hero.


sorrow: interchangeable with either grieve or mourn when sincere mental distress is implied, stresses the sense of regret or loss and of deep sadness and suggests an inner distress rather outward expression of grief: ~ed with great dignity.  


grieve悲痛: 表示真实的精神的痛苦，内心充满损失离别苦难，无论是否表现在外，mourn哀悼: 表示外在表达的悲痛，如因某人离世，可能真诚也可能常规，sorrow悲痛: 可与前两词互换，但表示真诚内心痛苦而非外在表达，强调遗憾损失深深悲哀


记忆方法: 1) 首字母MSG消息<==哀恸的消息                     MSG是message的标准缩写

         2) 哀恸的意思感到或表达悲伤mean to feel or express sorrow or grief.首字母MSG消息<==哀恸的消息       哀恸和哀痛的区别是: 哀恸表示极为哀痛, 八福中第一福是贫穷的人，第二福是哀恸的人: "blessed are those who mourn, for they shall be comforted哀恸的人有福了，因为他们必得安慰"