百度作业网时态区分
来源：学生作业帮 编辑：百度作业网作业帮 分类：英语作业 时间：2024/07/30 17:43:51
请帮我区分一下下面的时态，有时单选能做对但还是有问题 主要想问一下主被动问题，还有判断技巧 ，最好有例句 has been done has been doing had done was doing having done was done
解题思路： 理解句子含义；分析句子结构；熟悉英语语法；了解词汇短语辨析；熟悉英汉翻译。
解题过程：
你好，答疑如下 1，has been done是现在完成时的被动语态。现在完成时有两种情况，都描述现在的情形，一种动作发生在过去，另一种过去的动作持续到现在。 例如：He bas stayed here for two years. I have had supper already. 若动词与主语是被动关系，则用have been done 例如：The film has been seen twice. 2.has been doing 现在完成进行时。指过去的动作持续到现在，并连着持续下去。 例如：We have been looking for the lost ring. 3.had done 过去完成时。指发生在过去某个动作之前的动作，必须有过去时做参照。 例如：He had lived in BJ before he came here. 4.was doing 过去进行时。指过去某个点或时间多内持续发生的动作状态。 He was doing work this time yesterday. 5.having done 是现在分词的完成式，主要用于doing做状语时，若动作发生在谓语动作之前，就用having done 例如：Having worked for two years in London，he moved to China. 6.was done 指过去时态的被动式。 例如：He did work.改被动：Work was done by him. 总之时态看语境结合概念使用；主被动看动词与主语的关系。 愿你满意。
解题过程：
你好，答疑如下 1，has been done是现在完成时的被动语态。现在完成时有两种情况，都描述现在的情形，一种动作发生在过去，另一种过去的动作持续到现在。 例如：He bas stayed here for two years. I have had supper already. 若动词与主语是被动关系，则用have been done 例如：The film has been seen twice. 2.has been doing 现在完成进行时。指过去的动作持续到现在，并连着持续下去。 例如：We have been looking for the lost ring. 3.had done 过去完成时。指发生在过去某个动作之前的动作，必须有过去时做参照。 例如：He had lived in BJ before he came here. 4.was doing 过去进行时。指过去某个点或时间多内持续发生的动作状态。 He was doing work this time yesterday. 5.having done 是现在分词的完成式，主要用于doing做状语时，若动作发生在谓语动作之前，就用having done 例如：Having worked for two years in London，he moved to China. 6.was done 指过去时态的被动式。 例如：He did work.改被动：Work was done by him. 总之时态看语境结合概念使用；主被动看动词与主语的关系。 愿你满意。