謹以此信表達我對于……的遺憾。
點睛本句型是道歉信的開頭。其中，regret意為“遺憾；后悔；抱歉”，既可以作名詞，也可以作動詞。如：
We informed her with regret of our decision. 我們遺憾地把我們的決定告訴了她。句中的介詞for后面應(yīng)該接名詞或者名詞性短語。此外，regret也可以根據(jù)語境替換為apology（歉意），sorrow（悲傷）等詞。
句型拓展Here is my deepest apology for forgetting the appointment we had made. 我把約會給忘了，對此，我深表歉意。
I would like to express my apologies for not being able to keep our 9 o'clock appointment. 對于未能赴9點之約，我深表歉意。
I am sorry that I must apologize for not being able to help you when you asked me to give you a letter of introduction to the director of the National Institute of Oncology of my country. 您要我給我國的全國腫瘤學(xué)會負責人寫封介紹信一事，我未能幫上忙，對此我深感抱歉。
