Everyday English — Complaints and Apologies

"I'm afraid I have a complaint to make."

لماذا استخدم المتكلم I'm afraid في بداية جملة الشكوى؟ وما أثر ذلك؟

"I'm sorry to bother you but the bill you sent me was incorrect."

ما وظيفة I'm sorry to bother you but؟ وكيف يختلف عن قول the bill was incorrect مباشرة؟

"I must apologise, madam. I assure you it won't happen again."

ما الفرق بين I apologise وI'm sorry في سياق الاعتذار الرسمي؟

"Well, don't you think it's about time you got it working properly? It's very inconvenient."

ما معنى it's about time؟ وما الصيغة النحوية التي تتبعها؟