关于不带to的不定式，举个例子They did not observe she come in and go upstairs．被动：She wasn't observed (by them) to come in and go upstairs.带doing的就直接变换，因为doing的语法功能大体上相当于一个名词,及物动词直接加doing，不及物动词加介词再加名词/doing比如：She was considered having lunch already.She was devoted to studying computer.(这种情况很别扭，因为一般to doing的都是devote contribute,look forward,prefer之类的很主观的动词)还有一个超经典的：be used to doingShe was used to sleeping at 9 o'clock.她已经习惯于9点睡觉。这里边可不是被动语态，used大体相当个形容词
