Those stones,each weighing as much as four tons,came from the Alps Mountains.

题目

Those stones,each weighing as much as four tons,came from the Alps Mountains.
现在分词weighing在句中什么作用?定语?这是一道选择题,为什么不选动词不定式to weigh

答案

each weighing as much as four tons 这是独立主格结构.一般来说,动词不定式用于表示目的和即将发生的事情,这里显然不是.