A little girl was seen to fall into the lake by a PLA man.he jumped into the water to save her....

A little girl was seen to fall into the lake by a PLA man.he jumped into the water to save her....

题目
A little girl was seen to fall into the lake by a PLA man.he jumped into the water to save her....
A little girl was seen to fall into the lake by a PLA man.he jumped into the water to save her.请问这两句正确吗?如果正确的话,为什么在seen后用to fall?又为什么在water后用to save?
答案
正确的.第一个句子用的是see sb.do sth.的被动.其变为被动是:be seen to do sth.这是感官动词变被动时的规则,主动变被动,切记要加to.若是see sb.doing sth.变为被动则是:be seen doing .
第二个不定式做的是目的状语.
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