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关于被动语态与现在完成时

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关于被动语态与现在完成时
被动语态的现在完成时:have/has+been+done
现在完成时里,一些短暂性动词要变成延续性动词,就bave been done的形式
举例子:have been dead
那么,被动语态里的现在完成时和这个现在完成时不救没区别了吗?
是不是可以说,看到被动语态的现在完成时要考虑这个是完成时还是被动语态
我的想法对吗?
关于被动语态与现在完成时
现在完成时里,当与一段时间连用时,一些短暂性动词要变成延续性动词,如 come ,join ,borrow,buy 等.如果不与一段时间连用,就用短暂性动词.如 His brother joined the party last year.
His brother has been a party member for a year.
被动语态也要用这一原则.如 He has bought a house.
The house has been bought by him.
The house has been had by him for two years.