第十六节 状语从句
状语从句在复合句中起状语的作用，修饰主句中的动词，形容词或副词等。状语从句可分为时间、地点、原因、目的、结果、让步、比较（或方式）和条件等类。
1.时间状语从句
时间状语从句的引导词有when，as，while，after，before，since等。
I'll give it to him as soon as he comes back. 他一回来我就把这个给他。
You must listen attentively and take notes while I explain the text. 当我解释课文时你必须注意听并记笔记。
Before a transaction can be entered properly， it must be analyzed in order to determine which accounts are affected by the transaction. 在完整地记录一笔经济业务之前，必须进行分析，以确定哪些账户受经济业务的影响。
2.地点状语从句
地点状语从句的引导词有where，wherever.
Make a mark where you find an error. 在你发现有错的地方做个记号。
Where a situation involves dealing with an immediate problem， a manager would investigate the incidents which led to the problem. 当情况涉及一件需要立即处理的问题时，经理应当调查是什么导致这个问题的出现。
3.原因状语从句
引导原因状语从句的词有because，since，as等。
The determination of nationality is a crucial matter， because it has the potential of affecting all business operations. 确定国籍是一个关键问题，因为这个问题会影响所有的商业行为。
Since an investment is not classified as income or expense to the business， it is not considered in the income statement. 由于一项投资不是作为企业的收入或费用来分类的，因此在收益表里不考虑它。
4.目的状语从句
引导目的状语从句的词有：that，so that，inorderthat等。
We must work harder so that we may fulfil our plan ahead of schedule. 我们必须努力工作，以便能提前完成计划。
As she walked， she dropped the seeds along the road so that she would know the way back.
当她走路的时候，她沿路撒上种子以便她能知道回来的路。
5.结果状语从句
引导结果状语从句的词有so that，so…that等，如：
The coat was so expensive that I could not afford it. 这件外套非常贵，我买不起。
Work is of such a nature that details left to the control of the employee are limited. 工作的性质是由职员负责的细节无几。
6.比较状语从句
引导这类状语从句的词有：than，as，as if等。
He worked as fast as a qualified technician. 他干起活来和一个合格的技术员一样快。
The project was completed earlier than they had expected. 项目比他们预期的提前完成了。
In 1994 the plant produced twice as much steel as it did in 1981. 1994年工厂的钢产量比1981年翻了一番。
7.让步状语从句
引导让步状语从句的词有：though， although， no matter， whatever， even if， however等。
Although a wide variety of journals are used in business， the simplest form of journal is a twocolumn journal. 尽管企业使用的日记帐种类繁多，最简单的还是两栏式日记帐。
We'll start on our journey even if the weather is bad. 即使天气不好，我们也要去旅行。
8.条件状语从句
引导条件状语从句的词有if， unless， suppose， as long as等。
If you want to obtain data on employment opportunities， a good source is the Bulletin of the Department of Labour. 如果你想得到就业机会的材料，劳动部公报是一极好的来源。
If he has no objection， we will carry out the plan. 如果他不反对，我们将执行计划。
If you have any complaint you should bring them to the authority concemed. 如果你要投诉，可提交给有关当局。