不定式完成时与现在分词的完成时 还有过去分词的区别答:4) 完成进行时:She is known to have been wreaking on the problem for many years.省to 的动词不定式 1) 情态动词 ( 除ought 外,ought to):2) 使役动词 let, have, make:3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补...