4个步骤
主题句 - 条件 - 结果 - 影响
例子：
【主题句】Stress stems from the fierce competition among colleagues. 【条件】If every person aspries to success, 【结果】then this very desire will push people to scramble for limited position and resources at all costs, 【影响】thus creating intense pressure on every.
因果推论法如果写的字数比较少，可以当成是段落中的解释主题句的部分（就是 条件 - 结果 - 影响 这三句）再在后面写上例证法的例子
【主题句】Watching TV too much tends to have an unfavorable influence on the family relationship,【条件】by which I mean if one spends the vast majority of his spare time on television,【结果】he will lack sufficient time for communication with the family members, 【影响】which may possibly result in the alienation in the family.