UC知道some of the students saw this accident happen yesterday.happen为什么不用过去时happened
来源：百度知道 编辑：UC知道 时间：2024/06/06 08:48:38
因为这是see sth do sth的结构。和整句时态无关。
还有see sb doing/do sth的结构。
saw 已经用了过去时了，如果是1个句子的话，后面动词都用原形
see后面接动词原形
see sth. do
some of the passengers
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