经常说判断强调句就把it is/was...that/who结构去掉，结构完整就是强调句。例如：

It was ten o'clock when i went home. 用when而不能用that.为啥此句去掉以后句子就不完整了？这个完整是如何理解的呢？或者如何表述这个判断方法比较准确呢？语法网上有这样一个例句：Can you meet me Friday morning? 这个friday morning 解释为名词作状语，而ten o'clock不能呢？

It was ten o'clock when I went home.

=When I went home,it was ten o'clock

参考译文：当我回家的时候，时间是10点钟。

解答如下

以上为when引导时间状语从句,可以改为上面第2个句子。

Can you meet me Friday morning? 

这个friday morning 解释为名词作状语，而ten o'clock不能呢？

解答如下：

不可以改为ten o'clock,必须要改为“at ten o'clock in the afternoon/this afternoon”