非限制性定语从句对主句的某一成分进行补充说明，但并非对主语或宾语进行限制。例如，“我的妹妹，她是一名医生，下周要来拜访我们。”和“这部电影，它赢得了数个奖项，上个月上映。”等。
- My sister, who is a doctor, is coming to visit us next week. （我的妹妹，她是一名医生，下周要来拜访我们。）
- The movie, which won several awards, was released last month. （这部电影，它赢得了数个奖项，上个月上映。）
- My favorite color, blue, is very calming. （我最喜欢的颜色，蓝色，非常令人平静。）
- The book, written by a famous author, is a bestseller. （这本书，它是由一位著名作家所写，是畅销书。）
- The animals, which were rescued from the zoo, are now living in a sanctuary. （这些动物，它们是从动物园被救出来的，现在生活在一个避难所里。）
- My boss, who is always busy, is taking a vacation next month. （我的老板，他总是很忙，下个月要休假。）
- The building, designed by a famous architect, is a masterpiece. （这座建筑，它是由一位著名建筑师所设计，是杰作。）
- The weather, which has been very hot lately, is expected to cool down next week. （这段时间天气很热，但是下周预计会降温。）
- My friend, who speaks Spanish fluently, is planning a trip to Mexico. （我的朋友，他能够流利地说西班牙语，正在计划去墨西哥旅行。）
- The concert, featuring a famous singer, was sold out within hours. （这场音乐会，它以一位著名歌手为主题，几个小时内就售罄了。）
