plumtt12 This book is written in English ? or This book was written in English ? In this case you can use either one—for the reasons you have given.
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plumtt12This book is written in English? or This book was written in English?In this case you can use either one—for the reasons you have given. However, I can tell you that the present tense is the native choice because it's the current state of the book that is important, not its history.
plumtt12If I found an old book (about 100 years ago) written in English In this case, also using 'is'? Because this book is still in English. Right?Right! But please learn how to spell 'English' properly. I am not likely to help someone who ignores my corrections.