急急急~~~：I could see him ---(run)on the playground.帮忙分析一下用原型还是ing形式啊

could you see him ()basketball on the playground when you passed by yesterday afternoon?~

play
1. see sb do sth 看见某人做过某事，
I often see him draw a picture.
2. see sb doing sth 看见某人正在做某事。
When I pass the window I see him drawing a picture.
see是一个瞬间动作 不能一直看着的 所以 如果是接DOING的话 要接现在进行时 而题目里是过去进行时 过去进行时只是在过去的一个时刻看到的 更何况有see sb do sth 这个固定搭配

看见，比see更有力

running。
译文：我看到他正在操场上跑步。

I could see him 这部分主谓宾全齐，不缺成分，说明后面是定语，而且him和run是主动关系，故用ing形式。如果是he，那就要根据语境了。

非专业，仅供参考

都对 必须结合 语境 才能判断
I could see him run on the playground我能看到 他在操场跑完了步
I could see him running on the playground我能看到 他在操场跑步
这里我认为 用后者 现在分词做宾补 比较好 看 的同时 动作在发生

running 我看见他正在操场上跑。

是
ing形式

running

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