have been 和 has been 只是根据前面主语的人称而定.都是一般现在完成时
简单来说如果前面是I,you,we以及复数形式的主语则是have been
第3人称单数如he,she,it,则是用has been
有been的话表示被动语态
had been则是过去的过去,是过去完成时,和上面一样有been的话表示被动语态
如果都加done的话,都是表示已经做完某个事情,只是时态不同
had been 单复数用法没有区别 第一第三人称都是用had
请问HAS BEEN和 HAVE BEEN HAD BEEN的用法以及分别加DONE后的用法
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