Dear Mr. / Ms，
I was very concerned when I received your letter of yesterday complaining that the central heating system in your new house had not been completed by the date promised.
On referring to our earlier correspondence，I find that I had mistaken the date for completion. The fault is entirely mine and I deeply regret that it should have occurred.
I realize the inconvenience our oversight must be causing you and will do everything possible to avoid any further delay. I have already given instructions for the work to have priority and the engineers working on the job to be placed on overtime. These arrangements should see the installation completed by next weekend.
Yours faithfully
尊敬的先生/小姐，
昨天收到你的來信，抱怨你新家的中央加熱系統未按規定時間裝好，對此我非常關心。參考較早的通信，我發現我搞錯了完成日期。錯誤完全是我的，對此我非常抱歉。
認識到我們的疏忽給你造成的不便，我們將竭盡全力避免再耽擱。我已指示這項工作優先做并讓工程人員加班。這樣安排會于下周完成安裝。
你誠摯的
G. 提示Attention
1.Dear Mr. / Ms，
On 14 November I submitted a bill for services rendered to your office at the Lille International Exposition. More than a month has now elapsed without payment or acknowledgment of my bill. Please check this oversight，and remit payment at your earliest convenience. I look forward to future services to your corporation.
Thank you for your prompt attention to this matter.
Yours faithfully
尊敬的先生/小姐，
十一月十四日我向你辦公室在Lille國際博覽會上提供的服務提交了帳單。一個月過去了你既沒有付款也沒有認可帳單。請檢查這一疏忽并在最方便的時候付款。期望以后還為你公司服務。
謝謝您能對此事盡快重視起來。
你誠摯的
