I have had business （relation,关系） with him.(relative)
我已经跟他有了生意上的关系.his father's just back from work.(改反义疑问句）这个‘s为什么是is请解释be back, 回来。这一空缺少的是be动词。如果句子为 His father's just been back ...，这时已经有be动词，‘s则为has的缩写，是现在完成时态。