By the way, I've bought that book you recommended.
I bought that book you recommended.
I bought that book you had recommended.
Are all of these correct in this context? As in "By the way, I just want to let you know that..."
They are all grammatical, but you may not hear some of them very often. I would say: I bought the book you recommended. CB
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They are all grammatical, but you may not hear some of them very often. I would say: I bought the book you recommended.
CB