分词构句是指分词或分词片语修饰主要子句的主词和动词,表示时间、原因、条件、让步或附带情况等意思,通常放在主词之前,或主词与动词之间,并用逗点隔开.例如：
Walking along the street, he saw a bar.
在街上走时,他看到了一个酒吧.
表时间.
Being caught in the rain, he got a cold.
由于被雨淋了,他感冒了.
表原因.
Following this road, you will find the bus stop.
沿着这条路往前走,你会找到车站.
表条件.
She called out to the man on the street, asking for help.
她对街上的人喊,请求帮助.
表附带情况,与主要动词同时发出的另外动作.
Seated at the table, he was waiting for her.
他坐在桌子旁等候她.
表方式,分词构句中过去分词之前的being可以省略.
Granting that he was drunk, I won't excuse his conduct.
即使我承认他喝醉了,也不会原谅他的行为.
表让步.
2.分词构句中的逻辑主词必须是主要子句的主词.
