不定式完成时被动语态是英语语法中的一个难点，需要我们多加练习和掌握。下面给出一些例句，帮助大家更好地理解和应用该语法。
- The report is expected to have been finished by tomorrow. （报告预计会在明天之前完成。）
- The car seems to have been repaired poorly. （这辆车似乎修理得很差。）
- The project appears to have been abandoned by the company. （这个项目似乎被公司放弃了。）
- The book claims to have been written by a famous author. （这本书声称是由一位著名的作者写的。）
- The letter is believed to have been sent last week. （这封信据信是上周寄出的。）
- The movie is rumored to have been banned in some countries. （这部电影据说在一些国家被禁止上映。）
- The cake seems to have been baked perfectly. （这个蛋糕似乎烤得很完美。）
- The house appears to have been built in the 19th century. （这栋房子似乎是在19世纪建造的。）
- The song is said to have been written by a young musician. （这首歌据说是由一位年轻音乐家创作的。）
- The painting seems to have been done by a famous artist. （这幅画似乎是由一位著名艺术家完成的。）
以上例句展示了不定式完成时被动语态的用法和表达方式，希望能够对大家的英语学习有所帮助。
