did you see a boy running into the room 为什么用running

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did you see a boy running into the room 为什么用running

did you see a boy running into the room 为什么用running
did you see a boy running into the room 为什么用running

did you see a boy running into the room 为什么用running
因为在这里run这个动作是一瞬间的,而不是看到了全过程,所以用running而不用run

see sb. doing sth. 看见某人正在做某事

因为有固定搭配see doing是看见某个瞬间(动作)的意思