在prep语法笔记中看到date的几个句子，关于date短语做后置定语，要用ed形式还是ing形式产生了疑惑。请大家帮我看看：
首先看两个句子
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of adry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date at which humans are known to have made stone tools.
Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles islands.
上面两个句子可以看到date的主语是人的时候，date用主动。主语是物（即被定义的东西）时，date用被动。
但是下面两个句子：
The teeth and jawbones found in Tanzania by Dr. Mary Leakey and dating to 3.75 million years ago are the oldest reliably dated human fossils.
Native American burial sites dating back 5,000 years indicate that the residents of Maine at that time were part of a widespread culture of Algonquian-speaking people．
date做后置定语，为什么用ing了？而不是ed形式表被动呢？
下面这个句子就直接用主动了：
Many of the earliest known images of Hindu deities in India date from the time of the Kushan empire and were fashioned either from the spotted sandstone of Mathura or from Gandharan grey schist.
混乱了。。。在主被动方面，date到底怎么定义啊？
（or这个不算考点？） | 
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发表于 2013-4-4 17:48:19
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