when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?

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when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?
when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?

when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?
从下文（主句）叫警察来看,此事还在进行中
所以用 see sth happening 好些.
还有,如果用happened 不能看成是过去分词,因为happen不及物,而如果看成是过去式,时态又不对
请及时采纳,不懂继续问( 天天在线）

see sth doing 表示看到某事正在发生
see sth do 表示看到某事发生看到的是过程

it此处指代一种违法犯罪行为，这种行为有的持续时间短，如偷窃，一击得手，就完了，此时适合用happened，表示一个时间点。有的行为持续时间长，如入室盗窃，当你看见有人非法进入他人家中盗窃，此时行为要持续一段时间，那么用happening合适，表示一个时间段。
祝你学习愉快！ (*^__^*)
请及时采纳，多谢！...

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