I am sorry to say that the service at your restaurant was shoddy and unprofessional. 很遺憾我必須說,貴餐廳的服務既差勁又不專業。 It pains me to report that the shoes I purchased from you on Tuesday have already developed holes. 很遺憾我必須通知您,我星期二在貴公司買的鞋現在已經出現破洞了。 Unfortunately, I could not use the defective product you sent. 很不幸地我無法使用您寄來的產品,這些產品有缺陷。 I regret to inform you that......很遺憾我必須通知您......