以下是三篇100字左右的英文道歉信作文范文，涵盖不同场景：
一、因失约道歉
Dear Susan,
I’m very sorry that I was out when you came to see me yesterday evening. I went to the pub with friends and didn’t get back until 12 o’clock. I wish I had known you were in Luoyang as you could have joined us. I will call you at 10 o’clock on Saturday morning at your hotel to show you some local attractions. Please let me know if you’re available. Best wishes,
Chen Cheng
二、考试失利道歉
Dear Mr. Smith,
I am indeed very sorry that I missed the examination on International Business English Writing. I had no time to prepare due to unexpected family matters. I understand the importance of this test and sincerely apologize for any inconvenience caused. I hope you can forgive me. Cordially,
Li Ming
三、信息泄露道歉
Dear Ashley,
Please accept my deepest apologies for my mistake in leaking customer information to other departments. I realize the severity of this issue and take full responsibility. I am working with the IT team to prevent such incidents in the future. Thank you for your understanding.
注意事项 ：
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道歉信需简洁明了，直接说明原因；
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表达歉意后，可提出补救措施（如补测、陪同等）；
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注意使用礼貌用语，避免推卸责任。