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have been frightened out of their wits by giant fish bumping

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have been frightened out of their wits by giant fish bumping into them as they work
如题, 这句话里的 bumping为什么要用ing形式呢? 是作现在分词吗? 如果是作现在分词那前面怎么没有谓语BE呢? 求解释 还有bump into 是连用的吗?
have been frightened out of their wits by giant fish bumping
感觉你句子没有写全,所以不好分析.根据语法,bump放在By这个介词后面,肯定用Ing形式嘛.这个地方的bump Into 是连用,但根据不同情况,也可以和其它介词连用.