Lisa , whose parents have died in the crash , is an orphan . ) Present perfect because it is (presumably) a recent event, and her condition relates strongly to her present condition and the context of this statement.
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AnonymousWhy must it be "have died" rather than "died"?The simple past (died) is also possible. There is nothing in the sentence itself that requires the use of the present perfect. The use of the present perfect (have died) depends entirely on the broader context, and the broader context would basically have to be that the crash happened very recently (earli