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The old lady has never left the house since she moved in

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The old lady has never left the house since she moved in
为什么用left 而不用been away 呢 left不是短暂性动词吗 而这句话是现在完成时 不是应该用延续性动词been away 来 代替left吗
The old lady has never left the house since she moved in
如果是现在完成时肯定句,那么就不能用left
但是在否定句时就可以,因为对短暂性动词进行否定就变成延续性状态.
We haven't begun our new journey since last year.
同理.