sb is easy to get along with中to get along with是什么成分

怎么是作主语补足语呢?主语补足语是补充说明主语的,它与主语有逻辑上的主谓关系.换句话说,句子的主语同时也是主语补足语的逻辑主语.如：
She was seen to be crying.有人看到她在哭.( to be crying才是主语补足语）
而sb is easy to get along with中,sb是to get along with的逻辑宾语.
to get along with是状语.具体是什么状语我也说不上来,这里似乎是方式状语.