各位老师晚上好，

从各位老师讨论过程中，好像多数倾向于动态动词过去分词表达的是被动和完成的概念，但是我有几个例句如下：

1）A letter sent by airmail should arrive sooner than the one sent by regular mail.航空信应该比平信到得快.

这一句话,我个人认为A letter sent by airmail=A letter that is sent by airmail,应该相当于仅仅表达一般被动概念,并没有完成的概念.这里有一个问题就是，send在这里到底是看成动态动词，还是转态成静态动词？

2）The letter sent yesterday by airmail arrived here this morning at 9. 

这一句话,我个人认为The letter sent yesterday by airmail=The letter that was sent yesterday by airmail...,这里是相当于被动完成的概念。

从这两个例子来看,即使是同一个动词send,有时候表达的就是一般被动概念,有时候却是完成被动概念,也就是说过去分词表达的到底是完成被动概念，还是仅仅表达完成概念,到底是和动态动词和静态动词有关，还是和语义有关？

3) The villagers are regularly visited by doctors。这句话是原句，是否我们可以变换为：The villagers (who are) regularly visited by doctors are satisfied with their service.这样就是动态动词表示被动一般意义么？

4) The villagers were regularly visited by doctors last year. 是否可以变换为The villagers (who were) regularly visited by doctors last year will come to thank these doctors.这样,这些动态动词过去分词表达的是被动完成意义还是被动一般意义？

我记得张道真在谈论过去分词作定语的时候,讲过无须关注谓语动词的时态,是否也就和过去分词既可以表达被动一般又可以表达被动完成意义有关？

请老师抽时间帮讲解一下，多谢。