have sb/sth done.表示使……被……,让……做……。这是一种习惯用法。如:He had his leg broken.他伤到了腿。The teacher had Li Ming stood outside for he was late.老师因为李明迟到而让他站在外面。
现在完成时(have/has done)
①表示动作到现在为止已经完成或刚刚完成,强调对现在产生的影响。
例:I bought a new house, but I haven't sold my old one yet, so at the moment I have two houses.
我买了一所新房子,但是还没有卖掉旧的,所以现在我又两所房子。
②表示从过去某时刻开始,持续到现在的动作或情况,并且有可能会继续延续下去。此时经常用延续性动词。
时间状语常用since加一个过去的时间点,或for加一段时间,或by加一个现在时间。
例:Great as Newton was, many of his ideas have been challenged today and are being modified by the work of scientists of our time.
虽然牛顿是个伟大的人物,但他的许多见解直到今天还在受到挑战,并且被现代科学家的工作所修正。
现在完成进行时(have/has been doing)
表示某一动作开始于过去某一时间,延续或重复地出现至今,或将继续延续至将来。
例:We have been working on this project for over a month now.
到目前为止,我们一直在处理那个项目,已经花了一个多月时间了。



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艺考用户说说
友善是交流的起点