having been done的用法

完成被动进行Having been kept in the fridge for two hours, the food has gone bad.1）having been done一般强调被动的动作，而且该动作必须和主句动作之间有着明显的时间/逻辑上的先后/因果关系，且隐含having been done的动作不会再进行的意味。2）done做状语时更多时候强调的是一个可以延续的状态，而且它所表示的情况可以和主句动作同时存在。）Having been kept in the fridge for two hours, the food has gone bad.此题强调先有“be kept in the fridge”，才导致了后面的“go bad”.前后动词有明显的先后/因果关系，且隐含了“这食物不会再放在冰箱里保存”的含义了。2）Frightened by the news, he felt dizzy.其实frighteded by the news是由“he was frightened by the news”变化而来的，强调的更多是一种状态。其实在“他感到眩晕”的同时，他还在“感到害怕”。