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Since in the beginning of the sentence dictates that something started at some point in the past.
Structure: Since Past tense, Present Perfect/Present Continuous
So is there any rule to follow here for the second clause? because it appears that it sometime takes Present Perfect and sometimes it takes present continuous. should I go by any grammar rule or just by logic? if logic. what's the logic behind it?
Thanks!
Example this is an official answer of some exercise, so don't check if you are enrolled with e-GMAT
Ex:1 Since the first successful organ transplant was performed in the United States in the 1954, a serious problem faced by transplant recipients has been the possibility that their own bodies will try to reject or destroy the transplant.
Ex:2 Whereas, since 1987, the National Geographic Society has sponsored Geography Awareness Week to promote geographic literacy in schools, communities, and organizations, recent surveys have shown that the children do not get enough geography education to understand the world around them and are unprepared for an increasingly global future.
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