How to ask others politely in English?

This exam is not that important. Don't worry about it. We'd better leave. It is really time for us to go. It is getting late. We'd better leave. Let's face the reality. Let's face it. It often shows that the speaker is unwilling to avoid difficulties. I know this is a difficult situation. Let's face it, okay? Let's get started. Let's get started. Persuade others to say: don't just talk without practice. Let's get started. 7. I am really dead. I am really exhausted. Be honest with your feelings and say: I really died after doing so much work. 8. I have tried my best. I did my best. 9. Is that right? Is that really the case? It is usually used to express a person's surprise and doubt after hearing something. 10. Don't play games with me! Do not play games with me! T be sure. I don't know exactly. Stranger: Can you tell me the way to the City Hall? Tom: I'm not sure. May: You can ask the policeman over there. I'm not going to joke with you. I'm not kidding you. Karin: You quit? You're kidding. Jack: I won't joke with you. I am serious.