Modal perfect passive (must have been done)
Modal perfect passive (must have been done) 意思是 “情态完成时被动语态:情态动词 + have been + 过去分词,对过去的被动推测或评断”. 情态动词 + have been + 过去分词是对过去发生的事进行被动推测或评断的方式:It must have been stolen(我确信它被偷了). 接续: modal + have been + past participle
情态完成时被动语态:情态动词 + have been + 过去分词,对过去的被动推测或评断
B2接续
modal + have been + past participle
解释
情态动词 + have been + 过去分词是对过去发生的事进行被动推测或评断的方式:It must have been stolen(我确信它被偷了)。情态动词表明你有多确定——must(几乎确定)、may/might/could(有可能)、can't(不可能)——而 have been + 分词保留了过去被动的含义。主语承受了这个动作,而谁做的则未知或不重要。
例句
注意
除非执行者能提供信息,否则把它省去;如果执行者是重点,用主动的情态完成时更清楚:说 Someone must have taken it,而不说 It must have been taken by someone。
FAQ
Modal perfect passive (must have been done) — 是什么意思、怎么用?
情态完成时被动语态:情态动词 + have been + 过去分词,对过去的被动推测或评断. 情态动词 + have been + 过去分词是对过去发生的事进行被动推测或评断的方式:It must have been stolen(我确信它被偷了)。情态动词表明你有多确定——must(几乎确定)、may/might/could(有可能)、can't(不可能)——而 have been + 分词保留了过去被动的含义。主语承受了这个动作,而谁做的则未知或不重要。
Modal perfect passive (must have been done) — 怎么接续?
modal + have been + past participle
Modal perfect passive (must have been done) — 有什么注意点?
除非执行者能提供信息,否则把它省去;如果执行者是重点,用主动的情态完成时更清楚:说 Someone must have taken it,而不说 It must have been taken by someone。