分词结构可以代替从句，起连接作用。用分词结构代替从句时，如果主从句的主语一致，从句是主动语态，一般用现在分词，从句是被动语态，用过去分词；如果主从句的主语不一致，则用分词独立结构（名词／代词＋分词结构）代替从句。如：
1．分词结构代替时间状语从句，此时现在分词可与和原来连词同形的介词，如since，before，after等或与连词while，when，whenever等连用。例如：
Since I phoned you this morning，I have changed my plans．→Since phoning you this morning，I have changed my plans．
When it is seen from the hill，the city looks magnificent．→Seen from the hill，the city looks magnificent．
如果两个动作同时发生，多用 when或while ＋分词。例如：
I got to know him while I was attending a conference．→I got to know him while attending a conference．
2．分词结构代替原因从句。例如：
As I was anxious to please him，I bought him a nice present．→Being anxious to please him，I bought him a nice present．
Because so many people were absent，we decided to put the meeting off．→So many people being absent，we decided to put the meeting off．
3．分词结构代替条件从句，有时可与if，once， even if，unless等连用。例如：
Unless it is changed，this law will make life difficult for farmers．→Unless changed，this law will make life difficult for farmers．
I fall things are considered，his article is of greater value than yours．→All things considered，his article is of greater value than yours．
4．分词结构代替让步从句，可与连词though， although，whether．．．or等连用。例如：
While he admitted that he had received the stolen jewelery，he denied having taken part in the robbery．→（While）Admitting that he received the stolen jewelery，he denied having taken part in the robbery．
- 考试辅导
