1. As we watched, the fog, which had crept as far as the house, began to flow round it.

2. As far as I can see, you've done nothing wrong.

【答】句1，as far as the house 这个短语，实际仍然表示“比较意义”，说明：“远的程度跟那所房子一样”，the house 指一个具体的位置。 还有一种分析，就是把as far as 视为一个短语介词，后接地点名词，意为“远至那所房子”。又如：

We walked as far as the railroad station. 我们走到火车站那样远的地方。

My garden extends as far as the river. 我的花园一直伸展到河边。

The ladder won't quite reach as far as the window. 这梯子很难够到窗子。

We drive as far as the utmost end of this city. 我们开车到此城的边界。

I've read as far as the third chapter. 我已读到第三章了。

句2，如果as后面接句子，as则是“比较代词”。as在其引导的比较从句中，作see的宾语。也就是说，在从句中，as必须充当一个主要成分，如主语、宾语等。例如：

The desert continued as far as the eye could see. 沙漠一直伸展到视线的尽头。

They went as far as they could. 他们尽了最大努力走了那么远的路程。

The ocean stretched as far as they could see on all sides. 海洋十分辽阔，他们极目远眺无边无涯。

▲ as far as，本质上就是一个“原级比较用法”，现在已经演变成为一个固定用法，当作介词或连词使用均可。意为“跟......一样远”，还表示情况达到某种程度，意为“远到...；就…而言；在…范围内”。其他的几种意思都是由本义引申出来的。例如：

As far as I know, he will be away for three months. 据我所知（就像跟我知道的范围一样），他将离开三个月。

As far as I can see the whole matter is open-and-shut. 我看整件事是一清二楚。

As far as we can make out, the damage is due to improper packing. 根据我们弄清的事实，货损是因包装不善而造成的。

As far as I am concerned, I'm not against your plan. 就我而言，我并不反对你的计划。

The land west of the mountain stretches as far as the eye can see. 群山以西的地域一望无际。