英语问题Their classification and analysis occupied scientists fo

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英语问题
Their classification and analysis occupied scientists for years and led to a five-volume report, the last volume being published in 1895.中为何要用being?这其中有什么语法吗?

独立主格结构
独立主格结构(the absolute structure)是由名词或代词加上分词或分词短语构成的一种独立结构,用于修饰整个句子,而不是一个词或词组.独立主格结构中的名词或代词与其后的分词或分词短语构成逻辑上的主谓关系.这种结构与主句不发生句法上的联系,独立主格结构的位置相当灵活,可置于主句前、主句末或主句中,常由逗号将其与主句分开.需特别注意的是,独立主格结构与主句之间不能使用任何连接词.例如：
1)Night enshrouding the earth,nobody could make out what the dark mass was from a distance.(黑夜笼罩大地,谁也看不清远处黑压压的一片是什么东西.)
2)He lay at full length upon his stomach,his head resting upon his left forearm.(他的脊背朝天,四肢伸展,头枕着左臂,直挺挺地趴伏着.)
3)The coward was backing,his face being deathly pale,toward another room.(那个胆小鬼向另一个房间退去,脸色煞白.)
详见：http://edu.sina.com.cn/en/2004-01-18/18311.html

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