Taka Would the simple past also work? Yes. I think this is one of those cases when the past perfect tense is optional.
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TakaWould the simple past also work?Yes. I think this is one of those cases when the past perfect tense is optional. Without it, meaning of the sentence is still clear as day.
TakaWithout 'the other day', do you think the simple past would still work?Yes. Consider the natural order of events represented by the words buy and return. Could the returning happen before the buying?
Aspara Gus Without the past perfect and the other day, the reader can't tell that the book was bought before yesterday. But that isn't important.That's what I thought at first, so I asked the question.