no one had told me about there being a meeting the following day.为什么是there being

no one had told me about there being a meeting the following day.为什么是there being
no one had told me about there being a meeting the following day.为什么是there being

no one had told me about there being a meeting the following day.为什么是there being
这是一个独立主格结构
因为从句的主语（there)和主句的主语不一样,所以要用到独立主格结构.否则一个句子里面不能出现两个主语.

因为是跟在about后面呀～介词后面跟there be句型要用进行时表将来

about是介词，要跟宾语
there would be a meeting是一个完整句子，放在介词后做宾语必须把would be 换成 being

about 是介词，后跟动词的ing形式，与其后是否有there 无关。there be 表示某处有某物。

是独立主格结构。