1. I have the pleasure of stating, in answer to your inquiry of the 4th inst, that

　　2. In reply to your letter of the 5th of May, I have to inform you that (of)

　　3. I hasten to answer your inquiry of the l5th May, by stating that

　　4. We are in receipt of yours of the 5th June, in reply to which we are pleased to state that

　　5. In reply to yours of the l0th May, relative to..., I would say that

　　6. I am in receipt of your favour of the 7th May, and in response I inform you that (of)

　　7. In response to your letter of l0th May, I wish to say that

　　8. In answer to your favour of the 5th May regarding... I reply as follows:

　　9. Answering your letter of the 8th of February re..., I would say that

　　10. In reply to your letter of February 8th, I inform you that (of)

　　11. Replying to yours of the 8th of February regarding..., I would say that

　　12. Replying to your favour under date of February 8th re..., I say that

       非常遗憾，我们奉告您关于，等。

　　l. We regret to inform you that (of)

　　2. We are sorry to have to draw your attention to

　　3. We regret to have to say that

　　4. We regret to advise you that

　　5. We very much regret to announce you that

　　6. It is most regrettable that we have to inform you that (of)

　　7. It is with our greatest regret that we must inform you that (of)

　　8. To our greatest regret we must herewith inform you that (of)

　　9. It is a matter for regret that I have to inform you that (of)

　　10. It is to be regretted that I must inform you that (of)

　　11. It is with regret and reluctance that we have to inform you that (of)

　　12. It gives us a deep sorrow that we have to announce you that

　　13. It causes me much sorrow to have to say that

　　14. I feel sorry for having to announce you that

　　15. I express my sorrow for announcing you that