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Years ago I knew the distinction between "this book is different from that one" and "this book is longer than that one." How do you choose?

marked as duplicate by FumbleFingers word-choice Jun 11 '15 at 20:48

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"different from" is the normal thing, but in BrE you can also use different to sth, and in AmE different than sth. After comparative you always use than. http://www.oxfordlearnersdictionaries.com/definition/english/different?q=different

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