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.
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