作业帮The railroad accident was caused by a horse standing on the
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/10 06:17:10
The railroad accident was caused by a horse standing on the rails.stand为什么用ing形式?
主要是by a horse standing on the rail(由一匹站在铁轨上的马引起）,这是一个介词短语,作为was caused（被动语态）的状语.既然是短语不是句子,所以里面的stand就只能用动名词的形式,而不是动词原形.但如果用定语从句,那么就要用谓语动词了,不过句子就不那么简洁了,请对比：
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