Sunday, December 6, 2015

grammaticality - Present perfect or simple past?


I just came across this question:



This tree (be) _____ planted by the settlers who (found) _____ our city over four hundred years ago.




I think "over four hundred years ago" is an unspecified time. My answer was that the two gaps require present perfect. So I was a little surprised with the answer that both of them require simple past. Why is this the case?




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