look an old man walking carefully in the street.找出哪里错了

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look an old man walking carefully in the street.找出哪里错了
look an old man walking carefully in the street.找出哪里错了

look an old man walking carefully in the street.找出哪里错了
was walking

句子没有谓语。
应改为:look !an old man is walking carefully in the street .

walking 前面少BE动词,根据上下文时态选择is 或was

应该是an old man is walking carefully in the street因为这个句子没有谓语