一、现在完成时的谓语动词如果是短暂性动词，通常不能与表示一段时间的短语及短语（或从句）等连用。应将短暂性动词改为相应的延续性动词。如： 短暂性动词 延续性动词 borrow keep buy have die be dead come(to) be(in) go/leave be away become be fall sleep be asleep begin be on go out be out join be a member of marry be married1、 This factory opened twenty years ago. This factory has been open for twenty years.2、 Miss Gao left an hour ago. Miss Gao has been away for an hour.3、 Her teacher has been a Party member for 3 year
