帮我标出这句子的主谓宾,not far from the club there was a gardon,its own

its owner seated in it是过去分词独立主格结构,做伴随状语,修饰主句动词was；而playing bridge with children是现在分词作伴随状语,修饰seated.
这里牵扯到seat的用法：seat是及物动词,意为“使坐下”,普通要说He seated himself或Please be seated.
这个句子主干很简单,就是个there be结构there was a gardon,谈不上主谓宾的划分.确切地说,there was a garden是个倒装结构,garden是主语,was是谓语,there是表语.
主句的主语是garden,过去分词结构的主语与主句主语不一致,是owner,这就是过去分词的独立主格.学语言要靠多听多读来提高语感,不要被概念术语搞糊涂.分词作状语时,如果其逻辑主语与主句的逻辑主语不一致,就用到分词的独立主格.比如I seeing from the mountain top, the cars are small中,现在分词状语的主语是I,主句主语是cars,这就是现在分词的独立主格.如果说Seen from the mountain top, the cars are small,过去分词状语的逻辑主语和主句的逻辑主语一致,都是cars,就不用独立主格.
提醒：要想用whose,得说成whose owner was seated in it；要想用which,得说成in which its owner was seated.
——【译苦思甜】团队成员荣誉回答

Not far from the club there was a garden,its owner seated in it playing bridge with children every afternoon.
后面为什么用it而不是which or whose
你这里的it应该是its吧？
这句话中的its owner seated in it playing ...

可以用which但是要搭配上一个of 即 of which
whose 一般形容人，而且此处，整个句子是做定语。
这里主句是there be 句型。