推荐回答（1个）
（1）作时间或原因状语，通常位于句子前面。例如：
Hearing the knock on the door, they stopped talking.
（=When they heard...)听见有人敲门，他们停止了谈话。
Asked to work overtime that evening, I missed a wonderful film. （As I was asked to...)
由于那天晚上被要求加班，我错过了一场精彩的电影。
（2）作方式、陪衬或结果状语，通常位于句末。例如：
They stood there waiting for thebus. (and were waiting.) 他们站在那儿等公共汽车。
The bandits fled into the mountains, pursuedby the policemen. (and were pursued...) 匪徒向山里逃窜，警察在后面追捕着。
The hunters fired, wounding oneof the wolves. (and wounded one of the wolves)猎人开了枪，击伤了那群狼中的一只。
现在分词作时间状语，一般表示进行，主动（动作的执行者是句子的主语）
过去分词作时间状语，一般表示被动（句子的主语是动作的承受者）
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