i knew she had been absent all week这个是过去完成时吧? knew 后面省略了 that是吗? 为什么省略?为什么要加been?

分类: 作业答案 • 2021-12-20 07:10:44

问题描述：

i knew she had been absent all week
这个是过去完成时吧? knew 后面省略了 that是吗? 为什么省略?
为什么要加been?

答

因为 absent 是形容词是 be+形容词的句型.
She is absent.现在式
She had been absent.过去完成式.is 变成 had been
that 当连接词时,可以省略.