英语句子,用的什么语法?

是个经典的句子.很久没见到他了,It is [ that ] [ that was that he said.]
强调部分 原句
It's.that.是强调句,把强调句的外衣去掉后,句子就变成了That was that he said,其中that [he said]是定语从句.这里充分的利用了that这个词的意思和功能.第一个是代词,第二个是强调句的that,第三个又是代词