一、地点状语从句（不重要）连接词会一个where就可以了。
例如："The traditional rule was its safer to stay where you are.but thats been fundamemntally inverted,says one headhunter."
注意：stay是一个不及物动词，故后面接的不是宾语从句，是地点状语从句。
二、原因状语从句（重点）
连接词：because、since、as
例如：Our legal system was designed to set law apart from politics precisely because they are so closely tied.
Since desire and will are damaged by the presence of thoughts that do not accord with desire.Allen concluded:"We do not attract what we want,but what we are."
Now utopia has grown unfashionable,as we have gained a deeper appreciation of the range of threats facing us...
这里面的because、since、as都表示原因。
除此外还有：now that它表示显而易见。即显而易见的原因。
例如：Now that you have developed a topic into a tentative thesis,you can assemble your notes and begin to flesh out whatever outline you have made.
三、结果状语从句（重点）
连接词组：such...that 、 so...that --太...所以...
such接名词和名词词组，so接形容词和副词。
例如：Indeed,homelessness has reached such proportions that local governments can possibly cope.
We define such sold media as owned media whose tarffic is so strong that other organizations place their content or e-commerce engines within that environment.
proportions名词，故前面用such。strong形容词，故前面用so。
注意：so that有连在一起用的。表示：所以和so差不多的意思。
例如：Transitions should connect paragraph to the next so that there are no abrupt or confusing shifts.
四、目的状语从句（简单了解）
两个词组：so that如果有情态动词则表示目的，即接目的状语从句。没有情态动词就表示结果，即接结果状语从句。另一个词组是：in order that
例如：In December Americas Federal Trade Commission (FTC) proposed adding a "do not track"(DNT) option to internet browsers,so that users could tell advertisers that they did not want to be followed.
so that ... could ...有情态动词could，故该连接词连接的是目的状语从句。
