如何修改规律主语错误
SAT语法题目中的常见错误类型是规律主语错误，即句子的主语不是分词构造的规律主语。修改这种错误的方法很简洁，只要用隐蔽在句子中的规律主语替换掉句子原来的主语即可。我们通过以下四道例题来具体讲解这种方法：
1. Lacking good instruction,
〔my mistakes in creating a graph to illustrate historical trends were numerous
〕.(A) my mistakes in creating a graph to illustrate historical trends were numerous
(B) I made numerous mistakes in creating a graph to illustrate historical trends
(C) there were numerous mistakes in the graph I created to illustrate historica
l trends
(D) I created a graph to  ...