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He was seen to cross the street when a car bumped into him.中

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He was seen to cross the street when a car bumped into him.中的to cross是什么用法?改成crossing对么
He was seen to cross the street when a car bumped into him.中
(1) cross 问题
原本的词组是see sb do sth
因为当不含to的词组改成被动时要加to,所以才会出现to cross.
如:His father made him recite the poem.
被动要加to,变成:He was made to recite the poem.
(2) 解答crossing问题
可以改成crossing,因为see还有一个词组:see sb doing sth
而doing的词组在改成被动时不需要加to,所以也可以使用crossing