给定一篇文章和一个关键词，生成一个包含给定词形态变化形式的句子。
文章："华盛顿位于美国华盛顿哥伦比亚特区，是美国联邦政府所在地。"
关键词："Washington"
Washington is located in the District of Columbia and serves as the seat of the federal government of the United States.