if they see someone ( )wrong, they probably look the other way.

其实，这里是句型：see sb doing sth:看见某人正在走某事，但是这里没有动词，无法在其后面加上ing,而wrong又是形容词，所以就在wrong前面加上be,转换成其的ing形式，being,being wrong:错了，意思是一样，就相当于一楼的doing,意思一样，O(∩_∩)O~

if they see someone (doing)wrong, they probably look the other way.

see sb. doing sth.看见某人做什么

see sb.doing sth.
看见某人正在做某事

在see+O.+O.C.搭配中，动词作宾语补足语只有两种形式：do原形/V-ing，此处用V-ing形式表示“看见某人正在做某事”