1. where 引导名词从句作介词 from 的宾语从句。
例句：
The incident took place about 500 yards from where he was standing.
事件发生在距离他站的地方大约500码的地方。
Start reading from where you left off last time.
从上次停止的地方开始读。
Across the street from where we're standing, you can see the old churchyard.
从我们站的地方穿过街道，你可以看到古老的教堂墓地。
She swept up a hat from where it had fallen on the ground, and plunked it on her hair.
她从帽子掉落的地上捡帽子，把它戴在头发上。
It was near the ocean and Heather could hear the waves crashing on the reef from 、
where she lay in the bed.
那里靠近大海，希瑟从她躺的地方，可以听到海浪拍打礁石的声音。
2. from where 引导定语从句 关系副词 where 指代位置（location），而不是指具体的地方。例：
We stood on the top of the mountain, from where we could see the whole city.
我们站在山顶，从所在的山顶，我们能看到整座城市。
(说明:这里 from where = from on the top of the mountain )
The child stood behind the door, from where he stared at the quests.
孩子站在门后，从所在的门后，他盯着来客:
(说明:这里 from where = from behind the door)
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。
（from where(引导非限制性定语从句)，而未用from which，其中的where=in the tree，即 from where=from in the tree）
He hid himself under the bed, from where he could hear what they were talking.
他躲在床下面, 他可以从床下听到他们谈话。 （句中from where 可理解为 from under the bed, 意思是“从床下面”)
The captain stood at the window, from where he could see nothing but trees.
上尉站在窗前，从所在的窗前，他看到的只有树。
(说明:这里 from where = from at the window)
Soon after getting off his horse, the captain appeared at the second storey windows, from where he could see nothing but trees.
下马后不久，上尉出现在二楼的窗户前，从那里他看到的只是一些树。
I find many compositions on hills or high vantage points from where you can see into the far distance.
我发现很多作品都是在山上或高处拍摄的，从那里你可以看到很远的地方。（句中 from where 可理解成 from on hills or high vantage points）
Some people are standing under the big tree, from where they are enjoying a
wonderful of view of the town.
些人站在大树下，从所在的大树下，他们欣赏着眼前的城镇。
(说明:这里 from where = from under the big tree)
He hid himself behind the wall from where he still could see what would happen.
他躲在墙后面，从那里他还能看到将要发生的事情。（句中 from where 可理解成 behind the wall）
We walked for two and a half hours to get there - first up a mountain to a ridge from where we had fantastic views and then down a steep path to the valley below.
为了到达那里，我们走了两个半小时，先爬上山脊，从所在的山脊，我们欣赏到壮观的风景，然后沿着陡峭的小路，走向下面的山谷。
(说明:这里 from where =from on the ridge)
The baby's parents were sitting at a front-window table from where they had an unobstructed view of their child.
婴儿的父母坐在前排靠窗的桌子旁，从那里他们可以一览无睹地看到他们的孩子。
Carlos had crossed the room to a position from where he could look into the taproom.
卡洛斯穿过房间来到一个可以看到酒吧间的地方。
We drove to New York, from where we flew to Washington.
我们开车去了纽约，再从那里飞到华盛顿。 （句中New York 表示地理位置，而不是指 New York 这个城市）
China is the birth place of kites, and from where kite-flying spread to Japan, Korea, Thailand and India.
中国是风筝的发源地，风筝也从中国传到日本、韩国、泰国和印度。（同理，句中 China 指地理位置，而不是中国整个国家）
The biggest and the busiest port in Taiwan is Kaohsiung, from where millions of tons of goods are sent to other countries every year.
台湾最大、最繁忙的港口是高雄，每年有数百万吨货物从那里运往其他国家。
Instead, she looked up to the ceiling from where she got quite a lot of her inspiration.
相反，她抬头望着天花板，从那里她得到了很多灵感。（句中的 ceiling 表示抽象的概念，指代望着天花板的种种遐想， 而不是 ceiling 本身）
I will not be going back to the ranch, from where I had a lot of traumatic things happen to me.
我不会再回农场了，在那里我经历了很多创伤。（同上，ranch 是抽象概念，包括生活经历）
注意 from which 与 from where 引导定语从句的区别，用关系代词 which 是指代具体的事物。
例如：
Experience is a school from which you can never graduate.
经验是一所你永远无法毕业的学校。（which指代 school）
The floods were a cataclysm from which the local people never recovered.
洪水是一场灾难，当地人民再也没有从灾难中恢复过来。（which指代 cataclysm）
The victim received head injuries from which she died a week later.
受害者头部受伤，一周后死亡。（which 指代 head injuries， from 表示英语）
They built a platform in the trees from which they could watch the animals
unobserved.
他们在树上建了一个平台，在那里他们可以观察动物而不被发现。（which 指代 platform）
She climbed up to the top of the hill, from where she could have a good view of the whole town.
她登上山顶，从那里她可以一览全城风光。注: from where相当and from on the top of the hill或from on the top of which...
We went up to the roof ,from where we had a good view of the procession.我们爬到屋顶,在那儿我们可以一览整个行进队伍.(引导定语从句)
from where可理解为and from on the top of the roof或from on the top of which,
She climbed up to the top of the hill, from where she could have a good view of the whole town.(非限制性定语从句)
=She climbed up to the top of the hill and from on the top of the hill she could have a good view of the whole town.(有连词and 连接并列句)
=She climbed up to the top of the hill, from on the top of which she could have a good view of the whole town. (非限制性定语从句)
她登上山顶，从那里她可以一览全城风光。
from on the top of which相当于
A:and from on the top of the hil!
B:from on the top of which(which代替先行词the hill)
(引导定语从句)
顺便说一下，from有时其后可接when, where引导的宾语从句(可视为其前省略了the time, the place)：
He didn't speak to me from when we moved in. 从我们迁入之时起，他没和我说过话。
From where I stood I could see everything clearly. 从我站的地方我一切都看得清清楚楚。
