精选优质文档-倾情为你奉上英语被动语态总结一、被动语态的构成形式1. 被动语态的基本时态变化被动语态通常为十种时态的被动形式, 被动语态由“be过去分词”构成，be随时态的变化而变化。以do为例，各种时态的被动语态形式为：1) am/is/are +done (过去分词) 一般现在时Visitors are requested not to touch the exhibits. 2) has /have been done 现在完成时All the preparations for the task have been completed, and were ready to start.3) am/is /are being done 现在进行时A new cinema is being built here4) was/were done 一般过去时I was given ten minutes to decide whether I s
