现在分词表示主动和正在进行,过去时分词表示被动和动作已经完成.如: Please answer the question using another way. 请用另一种方式回答这个问题.(这里的主语省略了的you, you与use是主动关系.) Looked (=If it is looked) at a distance, the painting seems much more beautiful. 隔着一段距离看,这幅画似乎要漂亮得多. 不明白的再问哟!祝你学习进步,更上一层楼! (*^__^*)