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I am writing this letter to express my apology to you for taking your book by mistake. There is(应该用过去时) a sheer negligence for(用on或of) me. Because of my book is the same as yours. That day I confuse my book with yours in a hurry. I found it until arrived airplane. That must be cause(这里不能这样用两个动词) inconvenient(这是个形容词，cause后要用名词convenience) for you. It is impossible to return it to you at present. I am very sorry for bring about it. But you can use my book. I will return it to you as soon as I can. I do hope you can forgive me for my disastrous carelessness. Yours sincerely. | 
