has been后面通常接形容词,表达某事已经发生的状态。例如:"Only time will tell if the treatment has been successful." 只有时间才能证明这种疗法是否成功。
在句子里,"has been successful" 说明了疗法已经达到了某种结果。类似的句子有:"The system has been in operation for six months." 这个系统已经运行六个月了。这里的"has been in operation" 表示系统已处于运作状态。
还有:"The company has been investing in new plant and equipment." 这家公司一直在投资购置新机器和设备。"has been investing" 表示公司持续进行投资活动。
另外,"A new system has been devised to control traffic in the city." 控制城市交通的新系统已经设计出来。"has been devised" 说明新系统已被设计出来。
最后,"Digital television has been around for some time now." 数字电视已经面市一段时间了。"has been around" 表示数字电视已经存在了一段时间。
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