▲这里的 most 表示程度，相当于 very。如：

This news is most encouraging. 这个消息十分令人鼓舞。

It really was most kind of you to help. 你来帮忙真是好心。

Thank you for your help. I really am most grateful. 谢谢你的帮助，我真的非常感激。

而 most 前面的 all 在没有上下文的情况下，有两种可能的理解：一是将 all 理解为表强调，意思是“完全”（类似于He was dressed all in white.中的 all），二是将 all 理解为 it 的同位语，表示“这一切”。即：

It was all most interesting. 它极其有趣。（比单独用 most 语气更强）

It was all most interesting. 这一切都非常有趣。

比较：These books are all most interesting.这些书都非常用趣。

▲联想一：all together 与 altogether

1. all together 大家一道；全体都在；突然

We went to the cinema all together. 我们大家一道去电影院。

It has been so long since we were all together. 我们好久没有在一起团聚了。

Put the plates all together in the sink. 把盘子都放到水池子里。

2. altogether 总共；完全地；总的说来

He wrote six books altogether. 他总共写了6本书。

He is altogether wrong in what he says. 他所说的话全都不对。

Altogether our achievements are very great. 总的说来，我们的成绩是很大的。

▲联想二：all ready 与 already

1. all ready 全都准备好，完全准备好

Are you all ready? 你们都准备好了吗?

The data are (is) all ready for examination. 资料已全准备好供查考。

I was all ready to leave when the phone rang. 我正准备离开的时候电话铃响了起来。

2. already 已经

He has read the book already. 他已读过这本书。

By this time tomorrow I’ll have finished the job already. 到明天这个时候，我将已做完这工作。

We arrived at the cinema late. The film had already begun. 我们到电影院太晚了，电影已经开始。