如果我们要修饰一群事物的话可以考虑群修饰：
◆ Right: This model explains all known subatomic particles, SOME OF WHICH WERE only recently discovered.
◆ Right: This model explains all known subatomic particles, SOME OF THEM only recently discovered.
◆ Right: This model explains all known subatomic particles, SOME only recently discovered.
值得注意的是这种表达中只有which 后面是跟谓语动词，我们再看一种修饰：
His head held high, Owen walked out of the store.
在上面的这个句子中His head held high修饰后面的动词walked，表示Owen走出的状态，而在His head held high这个短语中，由一个名词His head 和一个名词修饰语held high构成，对于这种修饰方法我们也可以将其放在句尾或者用with的结构来修饰：
◆ Owen walked out of the store, his head held high.
◆ Owen walked out of the store with his head held high.
我们再看一个例子：
Scientists have found high levels of iridium in certain geological formations around the world, results that suggest the cataclysmic impact of a meteor millions of years ago.
在上面的例子中，results that suggest the cataclysmic impact of a meteor millions of years ago 进一步解释了found high levels，而这个修饰又由名词results及名词修饰语that suggest... years ago ,注意这时不存在就近修饰，语意上不可能修饰world。所以对于表示主句结果的我们可以用两种方式，一种是：句尾，V-ing的形式，另一种就是这种名词加名词修饰语。而在GMAT考试中我们常常会见到一种错误的选项：
Wrong: Scientists have found high levels of iridium in certain geological formations around the world, AND THIS suggests the cataclysmic impact of a meteor millions of years ago.
GMAT不喜欢用this或that因为这种代词指代对象不明确，因为一般情况下这种代词前面要加个名词。
