关于having been done 和 have been done的区别

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• in the history和in history 的区别就是这样一道选择题There have been many changes in _____ history of _____ English language.A.a;the B.the;/ C./;the D.the;the
• =英语一直不好的说 be后面加一个动词的过去式就是表被动?然后一般过去时的被动形式就是be+done吧?was/were +动词原形就是过去干什么什么,那was /were+动词的过去式有什么什么意思?be+动词过去式又是什么意思的说?have been done 的被动式是什么
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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?
• was/ were to have done,表示 “ 本打算 ” 、 “ 本计划 ” 或 “ 本应当 ” 做的事而没有做成或没有发生.如 :We were to have been married last year.那么以上的话要怎么翻译?到底结了还是没有?
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• have taught和have been taughting的区别
• have done 是现在完成时,表在过去发生的动作对现有影响.So far I have been to Beijing twice.
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