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hAD BEEn Doing 用法

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 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;...

1一直到过去某一时间为止,仍旧在继续进行的动作. They had been searching for six months when they found the treasure.当他们发现这些宝藏的时候已经寻找了六个月了。 他们发现这些宝藏是过去,寻找这个动作时过去的过去并且一直持续到他们发...

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...

因题干条件不完整,缺少文字,不能正常作答。

doing强调过去完成的影响持续到现在,是过去完成进行时,done过去完成时,过去已经完成的动作

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...

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...

was doing是过去进行时,表示过去正在发生.例如:She was washing when her son came in.(她儿子进来时她正在洗衣服.) had been doing是过去完成进行时,基本相当于过去完成时,但可以强调动作延续.例如:They had been playing chess for the wh...

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