The Present Perfect Passive Voice
1. 构成：现在完成时被动语态由”has/have + been + 及物动词的过去分词”构成。Has/have为助动词；
They haven’t been told the exciting news yet, have they? 他们还没有被告诉这个令人激动地消息，对吗？
1）since then, since+从句，so far, by now, up till, now, recently, lately, already, yet等常用于现在完成时的句子中。
2）ever, never, already, yet等副词用于现在完成时的被动语态时，放在has或have之后
2. 现在完成时被动语态用法
