Question

英语中逗号隔开，后加动词形式，如果是主语动作就用ing，如果有被动含义就ed

我一般这么简单的理解，也认为只有这两个形式。那有没有逗号加having的完成形式呢，如果是句子是过去式那是ing，还是ed呢
It rained continuously for a week ，completely ruining our holiday.

He，considered the best player in the world in those days，moved a basketball skillfully.....
第一句ruin用进行式，第二句move用过去式，为什么呀，不是同个主语吗

Answer 1

所谓的逗号，不是用于省略连接词的并列句，就是诸如存在同位语的情况。英语也是CC党哈[ Clear and Concise ]。就给你还原一下哈：
It rained for a week. It's ruining our holiday.
He was considered the best player in the world in those days while he moved a basketball skillfully...
现在，你觉得这两个词的时态或形式好理解了吗？正因为是同主语，所以省略得较多。