some of the students saw this accident happen yesterday.happen为什么不用过去时happened

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some of the students saw this accident happen yesterday.happen为什么不用过去时happened

some of the students saw this accident happen yesterday.happen为什么不用过去时happened
some of the students saw this accident happen yesterday.happen为什么不用过去时happened

some of the students saw this accident happen yesterday.happen为什么不用过去时happened
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