误The doctor decided to operate the patient right away.
正The doctor decided to operate on the patient right away.
外科医生为她施行了肿瘤切除手术。误The surgeons operated on her a tumour.
正The surgeons operated on her for a tumour.
析operate作“对…施行手术,对…开刀”解时须接介词on,再接某人,即operate on sb 结构。在表达“为某人施某种手术”时,则用介词for来引出“某种手术”,即operate on sb for sth 结构。