1、因未能践约赴宴致歉 Unable to keep one's promise
Dear Miss Nancy，
Much to my regret I was unable to keep my promise to attend your birthday party last Saturday，owing to the fact that my little son was suddenly taken ill early that day.
Hoping to see you soon.
2、因迟复来信致歉 Because of answering one's letter late
I am afraid that you will think me unpardonably negligent in not having answered your letter dated 7，December sooner，but when I have told you the reason，I trust you will be convinced that the neglect was excusable. When your letter arrived，I was just in Hong Kong. As my family could not forward it to me during my absence，it has been， therefore，lying on my desk until the moment when I took it up. Now the first thing I have to hasten to do is to write to you these few lines to express my deep regret.
I enjoyed many pleasant sights during my trip. I shall be pleased to give you an account to of them when I see you next.
3、因未能及时还书致歉 Unable to return borrowed book on time
Excuse me for my long delaying in returning to you your Robinson Crusoe which I read through with great interest. I had finished reading the book and was about to return it when my cousin came to see me. Never having seen the book， She was so interested in it that I had to retain it longer. However，I hope that in view of the additional delight thus afforded by your book， you will overlook my negligence in not returning it sooner.
Thanking you again for the loan.
I am writing this letter to express my regret…
I am writing to apologize for…
I would like to give you my apology for…
I am very sorry to say that…
I must apologize about (not) doing sth…
Please accept my sincere apology for…
I am writing to say sorry for…
I am terribly sorry, but…
Once again, I am sorry for any inconvenience caused.
Please allow me to say sorry again.
Hope you can accept my apologies and understand my situation.
I sincerely hope that you will be able to think in my position and accept my apologies.
I want to let you know how regretful I am feeling now.
I am sorry that I can’t… and trust that you will be able to understand.
One of your pen pals will shortly be visiting your city. For some reason, you can not manage to meet him at the airport on time. Write a letter:
1) explaining why you cannot meet him at the airport,
2) asking him to wait for you at the airport, and
3) telling him how to identify you.
You should write with no less than 100 words on Answer Sheet 2. Do not sign your own name at the end of the letter. Use “Li Ming”instead. You do not need to write the address.
I am looking forward to your visit. Just think, after all these years of writing to each other, we will finally have the chance to meet! However, I am sorry that I will not be able to meet you at the airport as soon as you arrive.
The reason is that your flight will arrive early in the morning, and the earliest I can get To the airport will be about an hour after you land. Please wait for me in the arrival lounge. You should be able to have breakfast there while you wait.
By the way, as we have never met I must tell you how to recognize me. I am of medium height and have a small moustache. In addition, I will be carrying a copy of the morning newspaper tucked under my left arm.