look an old man walking carefully in the street.找出哪里错了
问题描述：
look an old man walking carefully in the street.找出哪里错了
答
应该是an old man is walking carefully in the street因为这个句子没有谓语
答
walking 前面少BE动词，根据上下文时态选择is 或was
答
was walking
答
句子没有谓语。
应改为：look !an old man is walking carefully in the street .