Who are interested in taking part in it.为何加ed与ing?
问题描述：
Who are interested in taking part in it.为何加ed与ing?
答
be interested in doing sth 是固定用法‘对……感兴趣‘’
答
be interested in 固定搭配，对……感兴趣，前面修饰人Who，后面是因为前面有介词in ，所以用taking
答
首先,谓语部分可认为是短语be interested in的系表结构加介词短语,interested 可理解为形容词.
其次,因为in为介词所以其后所加动词短语take part in 转化为动名词短语（表主动）.