Bumping into someone even on a crowded street where it is difficult not to also calls for "I'm sorry“

Bumping into someone是句子的主语,also calls for "I'm sorry“是句子的谓语和宾语.even on a crowded street 是地点状语,where it is difficult not to是street的定语�ڴ˾����У�it����ʽ�ϵ����to���ߵ�����������������˾��ӵ���˼�ǡ���ȥ��ij�º����ѡ�