The drone was looking for unusual signals being sent to wireless devices.这句中的being何解?

2020-05-08 教育 93阅读
此句中的 being sent to wireless devices 在语法上解释为“分词短语作后置定语修饰先行词”(signals)。
signals being sent to wireless devices = signals [that are] being sent to wireless devices
being sent 是被动语态进行时,表达与主句谓语同时发生的动作。
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