had

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。