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changes has changed has been changed will change
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has made have made had made having made
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the past 30 million the past 40 million the past 50 million the past 10 million
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did the city change the city changed has the city changed the city has changed
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was, had taken place was, have taken place has been, had taken place has been, have taken place
is raising was raised has risen has been risen
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I have stayed here for twenty years ago. I stayed here for twenty years Twenty years has passed Twenty years have past.
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