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求大神语法指导Amightylongriversometimesflowsthroughabroadsectionwithplainslyingboundlessoneitherside,itswatersrollingonnon-stopforthousandsuponthousandsofmiles.后半句为什么用非谓语的形式.

题目详情
求大神语法指导
A mighty long river sometimes flows through a broad section with plains lying boundless on either side, its waters rolling on non-stop for thousands upon thousands of miles. 后半句为什么用非谓语的形式.
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答案和解析
A mighty long river sometimes flows through a broad section with plains lying boundless on either side,its waters rolling on non-stop for thousands upon thousands of miles.后半句是现在分词的独立主格结构 作伴随状语.
=and its waters roll on non-stop for thousands upon thousands of miles.