[文法] what would have been的用法
想請教板上前輩，小弟的朋友和小弟討論一個句子如下
On what would have been Anne Frank's 75th birthday, Gies, then 96,
^^^^^^^^^^^^^^^^^^^^
told People magazine.
這邊what would have been是一個片語嗎? 小弟有拿畫線的句子去google，
是有看到類似的用法(後面接生日)，小弟原本認為是 on the day that=what(複合關代)
不過複合關代應該只有 the things which=what
所以不知這個文法要如何解釋，謝謝
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