1-I buy a lot of books that I don't read, but I also buy a lot of books that I do read. 2-I buy a lot of books and don't read them. But I also buy a lot of other books and do read them.
Top answer
I would say this. I buy a lot of books, but I do not read them all.
— Vsuresh
I would say this.
I buy a lot of books, but I do not read them all.
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Both sentences are correct. Many prefer to use 'however' to start a sentence instead of 'but' esp. in formal writing in which case sentence 1 is more appropriate.