当前后分句主语一致时,可以使用分词结构.分为现在分词结构和过去分词结构.现在分词结构表主动,过去分词结构表被动.
新概念3中例句：
现在分词：
Lesson2 Thirteen equals one:
Looking at his watch,he saw that it was one o'clock,but the bell struck thirteen times before it stopped.
Lesson13 'It's only me':
Not wanting to frighten the poor man ,Mrs.Richards quickly hid in the small storeroom under the stairs.
过去分词：
Lesson2 Thirteen equals one:
Armed with a torch,the vicar went up into the clock tower to see what was going on.
课外例句：
Putting a dress on,I heard there is someone knocking the front door.