我在新概念三的课本看到下面的两个句子。
Paw prints were seen in a number of places and Puma fur was found clinging to bushes.
As no Puma had been reported missing from any zoo in the country, this one must have been in the possession of a private collector and somehow managed to escape.
上面的两个句子clinging和missing 书上说都是做主语补足语?我只知道现在分词可以作为状语表示伴随,原因,结果等等·第一次听说可以做主语补足语!现在语法体系中有主语补足语这样的说法吗?