短暂性动词 如果要表示延续性 要改成keep 如
I received the book 4 years ago 我四年前接到这本书 若把该句改成完成时要改为
I have kept the book for 4 years 这本书我已经保存了四年
不可以用 I have received the book for 4 years
短暂性动词 如果要表示延续性 要改成keep 如
I received the book 4 years ago 我四年前接到这本书 若把该句改成完成时要改为
I have kept the book for 4 years 这本书我已经保存了四年
不可以用 I have received the book for 4 years