1. 一般现在时的被动语态：The book is written by the author.
2. 一般过去时的被动语态：The report was submitted by the team.
3. 现在完成时的被动语态：The project has been completed by the end of last month.
4. 过去完成时的被动语态：The experiment had been finished before the meeting began.
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