when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?
人气：491 ℃ 时间：2020-03-26 21:15:28
解答
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 ）
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