GMAT考试中常见的考查代词语法的方式有以下几种

　　1.在平行结构中，一个从句的主语有时会同样被引用到另一个从句中充当主语的角色：

　　◆ Right: Supernovas destroy their immediate environments in vast explosions, BUT by synthesizing heavy chemical elements, explosions, THEY provide the universe with the possibility of biochemistry-based life as we know it.

　　Supernovas是第一句的主语，第二句与第一句平行，而THEY是第二句的主语，虽然像environments 和explosions离之很近，但这并没有让我们产生对THEY指代Supernovas的怀疑。

　　2.名词所有格要特别注意指代问题

　　◆ Wrong: The board is investigating several executives’ compensation packages in order to determine how much may have been improperly awarded to THEM.

　　这句话，them应更好指代packages而非executives’但句意上来说指代executives却是更为合理的。根据语法规则，只有物主代词才能指代所有名词所有格。所以更好的句子应该改成：

　　◆ Better: The board is investigating the compensation packages of several executives in order to determine how much THESE EXECUTIVES may have been improperly awarded.