在gmat备考之中，大家都会遇到gmat写作中的一些问题，经过网友的分析总结，下面就来看看AA中的'“七宗罪”可以按照论证的原因、结果、论证过程三部分，归为三个类别：因、果、证，接着就来看看具体情况。
1、因
就是原因上的问题，有以下三个：
可疑调查
样本不足
结论无据
2、果
就是结论上的问题，有以下两个：
无因果联系
二者择一
3、证
就是论证过程上的问题，有以下两个，纵向横向各一个：
错误类比(横向)
时地全等(纵向)
这样，只要记住了三字诀：因、果、证，就很容易记牢全部七宗罪了。
顺便分析一下本月JJ的一篇AA：
“Our total sales have increased this year by 20 percent since we added a pharmacy section to our
grocery store. Clearly, the customer’s main concern is the convenience afforded by one-stop
shopping. // 无因果联系，可能另有他因。 The surest way to increase our profits over the next couple
of years, therefore, is to add a clothing department along with an automotive supplies and repair
shop. We should also plan to continue adding new departments and services, such as a restaurant
and a garden shop, in subsequent years. // 时地全等 Being the only store in the area that offers such a range of services will give us a competitive advantage over other local stores.” // 结论无据