不好意思啊,回復(fù)晚了點
to have done 這里的to 一般都是和前面的詞連用的,這也就是 不定式+完成時態(tài) 的結(jié)構(gòu)
舉幾個例子吧：
It is thought to have happened .
It is believed to have been the largest.
還有was/ were to have done,表示 “本打算”、“本計劃”或“本應(yīng)當” 做的事而沒有做成或沒有發(fā)生.所以是情況而定哦.