having been done ,having done 这个非谓语动词在句子中不可以充当什么成分

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• 语法中,现在分词,过去分词作定语的用法!1-什么情况下分词不能与定语从句互换?我查到的例子中有这样一条规则：如主句谓语是现在时,从句谓语事过去时时.例如：The foreigner who visited our class yesterday is from Canada.(≠The foreigner visited our class yesterday is from Canada.)但是之后看的很多例句把这条推翻了,所以这条规则更详细一点说,是不是区别在延续性/非延续性动词上了?2-过去分词（不及物的）作定语表示完成,那么此时和现在分词的having done有什么区别?（除了having done不能作定语）,也就是说,过去分词表示的完成（have done）时态上怎么看?3很多语法书上写,特定的不及物动词可以有v-ed形式做定语,这个"特定"怎么定义?我怎么样就可以知道哪个可以哪个不可以?
• 请教一道非谓语动词方面的英语题原题：—---twice,he didn't want to try again.A：to have failedB:having failedC；failedD：having been failed我不理解为什么不选AAB我认为都可以表示动作先于谓语发生TO have done 也可以表示动作先于谓语发生例如;I am sorry to have kept you waiting.我很抱歉让你久等了,这个句子也没有表示将来啊
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• having been done ,having done 这个非谓语动词在句子中不可以充当什么成分
• What you have done might do harm to other people.详细分析一下句子结构,哪是主谓宾What is important is to learn English这句话也是主语从句只不过句型变了，这句话里面的两个is 和What you have done might do harm to other people这个句子里面的done和might在句子中的充当的作用是一样的。充当句子中的动词和谓语成分，
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