He had come up from deep down in the water as the dark cloud of blood had settled and dispersed in the mile deep sea. 

网友为何总喜欢发明一些所谓的语法术语（例如：in the water 嵌套 from deep down 修饰 come up？）

1. 其实，本句的come up from deep down in the water 这个动词词组，come up （up是副词），看作整体不拆开。from deep down 是介词短语作状语，说明come up 的“来源；源头”，in the water是介词短语作deep down的定语。

2. come up from deep down in the water，整个词组的意思是：“从水中的深处出来”。

3. 这个结构的真正疑问：是deep down 是什么词性，能否作from 的宾语？

介词 from 用法比较特殊。其特点是：它可以接“地点副词”作宾语，构成介词短语。例如：

from here, from there, from where, from below, from above, from outside, from downstairs 以及本句的 from deep down 等。

现以 from where 为例举例说明：

第一组：where 为疑问副词

Where do you come from? = Where are you from? 你是哪里人?

Where did you get that book from? 这本书你是从哪里买来的？

第二组：where 为连接副词引导名词性从句

Start reading from where you left off last time.  从上次停下来的地方接着读吧。

The blood spread rapidly from where he lay.  鲜血从他躺的地方很快流淌开来。

第三组：where 为关系副词引导定语从句

He hid himself in a tree, from where he could see the enemy in the distance. 他躲在一棵树上，从那儿他可以看到远处的敌人。

We went up to the roof, from where we had a good view of the procession. 我们爬上屋顶，从那儿可以很好地观看游行。