stay完成时前面加have， have stayed 留下来；
stay的意思是
v.停留;保持;待;逗留;继续是;暂住；
n.停留;逗留(时间);作客;(船桅的)支索;(杆子等的)牵索，撑条
They have stayed in big cities and small villages.
他们曾在大城市和小村庄待过。
The lessons that I learned from that experience have stayed with me all my life.
我从那次经历中学到的教训一直伴随着我。
The fever have stayed high for more than two days.
我高烧持续两天多了。
We might just as well have stayed at home.
我们当初实不妨留在家里。
Master, you have stayed so long this time.
主人，你这次待了这么久。
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