概述
副词子句在简化时，比较特殊的是连接词的处理，当副词子句的连接词既不空洞、又不重复时，需要保留下来，句子的意思才不会有损失。
简化为分词构句
此所谓分词构句
While I stayed at my uncle’s,I dined out every night.
(While）Staying at my uncle’s,I dined out every night.
现在分词构句
Because he was itching to be playing again,the boy inserted more coins.
Itching to be playing again,the boy inserted more coins.
1.句首的副词从句往往有表示[原因]的功能
2.主句和从句的主语相同
同理，句尾的副词从句往往有表示[结果]的功能
过去分词构句
所谓被动态
If it is provoked,a rhino can be very dangerous.
If provoked,a rhino can be very dangerous.
注意，主句和从句主语相同
When the job was concluded,the secretary went home.
The job concluded,the secretary went home.
此时，主语是不同的，不可以省略
Being和Having been的理解
- 强调进行状态
- 进行词类变化
I was nice.
I was being nice.
分词构句的位置
- 句首
Entering the classromm,the teacher greeted the students.
- 句中
The teacher entering the classroom greeted the students. 关系子句
The teacher,entering the classroom,greeted the students. 副词从句
- 句尾
The teacher greeted the students entering the classroom. 关系子句
The teacher greeted the students,entering the classroom. 副词子句
简化为To+V
副词子句中的动词片语中如果包括语气助动词在内，就可以简化为不定式。
如果简化为不定式片语，那么只要意思够清楚，副词子句的主词就可以省略来做简化。
in order to
The student studied hard in order that he could get a scholarship.
The student studied hard in order to get a scholarship.
so as to
The boy left home early so that he could be in time for the concert.
The boy left so as to be in time for the concert.
类似的连接词还有so…as to,such…as to,only to,too…to,ehough…to
简化为介系词片语
补语为介系词片语
如果副词子句是介系词片语当主词补语，那么简化掉主词与be动词之后，剩下的就是介系词片语
While on duty,the officer never drinks.
连词直接转变为介系词
有一些副词子句的连接词兼有连接词和介系词两种词性，如果后面有限定子句，他就是连接词，如果后面的子句简化了，这些连接词自动变为介系词。
before,after,since,until,for,as
Before
That man used to be a gangster before he joined the army.
That man used to be a gangster before joining the army.
连接词改为介系词
将连接词改为意思接近的介系词，整个子句简化为介系词片语。
Although
可改为despite,despite of
The girl is determined to marry her bofriend although her parents object strongly.
The girl is determined to marry her bofriend despite her parents’ strong objection.
Although he was not told to enter,the salesperson came in.
Without being told to enter,the salesperson came in.
Because
可改为because of,owing to,due to,as a result of,with等介系词
The little resort town is crowded because there has been an influx of tourist.
The little resort town is crowded,with an influx of tourist.
Because he has prepared adequately,the student did well at the exam.
As a result of adequate preparation,the student did well at the exam.
When
可改为on,upon,at等
When she heard her child cry,the woman rushed into the bedroom.
On hearing her child cry,the woman rushed into the bedroom.
If
可改为in case of
If the river rises above the red line,the village nearby will be evacuated.
In case of the river rising above the red line,the village nearby will be evacuated.
