there is a girl reading English under the tree
问题描述：
there is a girl reading English under the tree
为什么用reading
答
因为a girl 和 read 之间是主动关系,表主动,进行要用现在分词,即：reading
reading English under the tree 是现在分词短语做后置定语,修饰a girl
等于定语从句 who is reading English under the tree意思是说reading是过去分词？ 能再讲明白点么是表主动， 进行的用现在分词