在上述两种情况下，分词所做的状语可以相当于一个状语从句。此时可在分词前加一个引导词如when, if, though, unless, before, after等 ，这就构成了省略。
Arriving at the station, he found a crowd of people waiting there.
= When he arrived at the station, he……
= When arriving at the station, he……
More Examples
Inspired by the excellent situation, the workers worked even harder.
= After/Because they were inspired by ……
= After/Because inspired by ……
Heating water, you can change it into steam.
= If you heat water, you can ……
= If heating water, you can……
Though beaten by another football team, the players of GuoAn did not lose confidence.
= Though they were beaten by ……
(3) 表方式、结果及伴随状况。(不能用相当的状从替代)
a. Laughing and talking, the students went out from the cinema.
b. He came running back to tell us the news.
c. She stood there waiting for the bus.
d. The bandits fled into the mountains, pursued by the policemen. 匪徒向山里逃窜，警察在后面追捕着。
分词独立结构
分词独立结构：一般分词作状语时，它的逻辑主语应是句子的主语，但有时分词的逻辑主语是其它的名/ 代词，n. / pron. +分词的结构就是独立(主格)结构。
A new technique ____, the yields as a whole increased by 20%. (90.1 CET-4)
Answer: having been worked out.