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I apologise deeply for my mistake. However, you should have reminded me to give back your book. |
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I’m sorry to disturb you, but could you possibly return the book that I lent you a few months ago? |
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I would say I’m sorry, but since we are really close friends and know each other well, I know you’ll let this one go. |
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I regret to inform you that I have lost your book. However, I will buy you an exact copy to compensate for my mistake. |
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I’m so sorry for not returning your book on time, I forgot all about it. I’ll get it back to you as soon as I see you. |