例句：mount tai, which is located in shandong province and covers an area of 360 square kilometers, (located in shandong province and covering an area of 369 square kilometers)
两个基本原则：
主动和被动的原则
表达主动，现在分词
表达被动，过去分词
练习：
a bridge linking china with america
a measure taken by chinese government
n+being done
an issue being discussed
n+having done
china having entered into the wto
n+having been +doing
chinese government having beening safeguarding the interests and rights of medium-sized or small countries