现在分词的被动完成式先于谓语动词发生的动作，过去分词所表示的动修，有时发生在谓语动词之前，有时与谓语动词同时发生，有时表示未来的被动动作或状态。例：用了很长时间这块表需要修理。Having been used for a long time,the watch need to be mended.
Used in this way,the word should not be taken as averb .
Given more time ,we will finish the work in time .
