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hAD Doing

have been doing 网络 现在完成进行时; 现在完成进行时态; 完成进行时态; 现在完成进行; 将来完成进行时 Biological systems have been doing this for billions of years. 生物系统亿万年来一直都是这样。 had been doing 网络 过去完成进行时;...

你好楼主, 这两个时态不一样,had been doing是过去完成进行时,就是相对过去的某个时刻来说已经对现在有直接影响并且还在进行的动作。 而have been doing是现在完成进行时,其表达的意思有两种:1.表示从过去某时开始一直持续到现在的动作,并...

1、首先要区分has been done与 had been done的区别:have/has been done 是现在完成时的被动语态。表示某事被做,。 如:The problems have been solved.这些问题已经被解决了。 had been done 则是过去的过去,是过去完成的被动态时...

1、首先要区分has been done与 had been done的区别: have/has been done 是现在完成时的被动语态。表示某事被做,。 如:The problems have been solved.这些问题已经被解决了。 had been done 则是过去的过去,是过去完成的被动态时。(当你...

have sb do sth是指让某人做某事,强调一次性的动作。 have sb doing sth是指让某人一直做某事,强调动作的持续性、连续性或者动作的反复性。 I had Mary clean my bedroom yesterday. 昨天我让玛丽打扫了我的卧室。(一次性的动作) He had us ...

had been done过去某个时间之前已经被做、被完成 had been doing过去某个时间之前已经在做或者继续在做 had be done是错的。时态和语态多不对。 had being done也是错误的。时态和语态都不对。 had纯粹的过去动作。

当然有了。 had tried doing已经尝试做…… He had tried making a model plane but failed.

第一个正确,你可以按以下方式理解: have为动词,动词后面接名词 有困难 have difficulty 这里其实省略了介词in have difficulty in doing sth 在做某事时有困难。 希望可以帮助你。

to do

这里的时态叫过去完成进行时,就是过去完成(had done)和进行时(be doing)合起来,最终结构是had been doing表示的是主动含义,还有延续的含义,表示我在戒烟前一直是每天三包烟。 被动的表达是be+done(过去分词),be动词后面跟的一定是过去分...

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