1. as if / as though。表示“好像,仿佛”,引导表语从句或方式状语从句。如:

It looks as if / as though it is going to snow. 看起来要下雪啦。

He looks as if / as though he had seen a ghost. 他的脸色看起来好像他看见了鬼。

He talks as if /as though he knew everything about it. 他说话的口气好像他已经全部都知道了。

2. as [so] long as。“只要”,引导条件状语从句。如:

As [So] long as you can keep away from them, you will be safe. 只要你能远离他们,你就安全了。

I’m happy as long as you are happy. 只要你幸福,我就感到幸福了。

3. as [so] far as。表示“在……的范围内”,引导限制状语从句。多用于下列结构:as [so] far as I know(据我所知),as [so] far as I can see, as [so] far as I’m concerned(依我看)。如:

As [So] far as I know, the couple have been abroad for about five years. 据我所知,这对夫妇已经出国约五年了。

There’s only one thing to be done now, as far as I can see. 依我看。现在只有一件事情要做。

4. as soon as。表示“一……就”,引导时间状语从句。如:

As soon as he got off the plane, he telephoned her girl friend. 他一下飞机就给他的女朋友打了个电话。

He started as soon as he received the news. 他一得到消息就出发了。

总之,由于as的用法复杂,同学们在学习时一定要注意比较其在不同句子中的作用,判断其连接的是什么样的从句,多做一些关于相关练习,这样便可掌握其用法了。

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