所有格

句子的修饰中对于名词所有格('s或S'结尾的名词)同样值得注意：

　　◆ Wrong: Unskilled in complex math, Bill’s score on the exam was poor.

在这里，Unskilled in complex math 应修饰Bill，但此处却是Bill’s，所以句意变成Bill’s score是Unskilled in complex math ，显然这非作者要表达的意思。要改正：

　　◆ Right: Unskilled in complex math, Bill did not score well on the exam.

我们再来看一个例子：

　　◆ Only in the past century has origami’s development, a ceremonial activity invented millennia ago, into a true art form taken place.

上面的例子中句意变成了the development of origami was a ceremonial activity，所以不要忽视development或其他抽象的名词。他们遵循相同的规则：邻近的修饰语将修饰这个名词。所以上面的句子改写为：

　　◆ Origami—a ceremonial activity invented millennia ago—has developed into a true art form only in the past century.

我们日常英语有时会看到这种形式的所有格OF X’s，但是在GMAT中这是错误的格式，选择OF X或者X’s

　　◆ Wrong: The orca, a relative of the blue whale’s, is found throughout he globe.

　　◆ Right: The orca, a relative of the blue whale, is found throughout the globe.