请你帮忙根据下面这篇英语对话内容制作一个英语对话视频，这篇对话是新概念英语教材的内容，请赋予这个视频有英语教学效果。“Ann: Look, Harry! That policeman’s waving to you. He wants you to stop. Policeman: Where do you think you are? On a race track? You must have been driving at seventy miles an hour. Harry: I can’t have been. Policeman: I was doing eighty when I overtook you. Policeman: Didn’t you see the speed limit? Harry: I’m afraid I didn’t, officer. I must have been dreaming. Ann: He wasn’t dreaming, officer. I was telling him to drive slowly. Harry: That’s why I didn’t see the sign. Policeman: Let me see your driving‑licence and your insurance certificate. Policeman: I won’t charge you this time. But you’d better not do it again! Harry: Thank you. I’ll certainly be more careful. Ann: I told you to drive slowly, Harry. Harry: You always tell me to drive slowly, darling. Ann: Well, next time you’d better take my advice!”

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Welcome to our New Concept English lesson about a traffic stop dialogue. Today we'll learn key vocabulary related to traffic situations and practice modal verbs of deduction. Let's start by reviewing important words you'll hear in this conversation. Before we listen to the dialogue, let's understand modal verbs of deduction. These express how certain we are about past events. Must have shows high certainty, can't have shows certainty something didn't happen, and might have or may have show possibility. Ann says: Look, Harry! That policeman's waving to you. He wants you to stop. The policeman asks: Where do you think you are? On a race track? You must have been driving at seventy miles an hour. Harry responds: I can't have been. The policeman continues: I was doing eighty when I overtook you. The policeman asks: Didn't you see the speed limit? Harry admits: I'm afraid I didn't, officer. I must have been dreaming. Ann defends: He wasn't dreaming, officer. I was telling him to drive slowly. Harry explains: That's why I didn't see the sign. The policeman requests: Let me see your driving license and your insurance certificate. The policeman shows mercy: I won't charge you this time. But you'd better not do it again! Harry is grateful: Thank you. I'll certainly be more careful. Ann reminds him: I told you to drive slowly, Harry. Harry responds: You always tell me to drive slowly, darling. Ann concludes: Well, next time you'd better take my advice! This dialogue demonstrates modal verbs of deduction, past tenses, and giving advice. Practice these patterns to improve your English conversation skills! Now let's listen to the first part of our dialogue. Ann notices the policeman waving at them. The policeman questions Harry's speed, saying he must have been driving at seventy miles per hour. Harry denies this using can't have been. Notice how these modal verbs express different levels of certainty about past events. Let's analyze the modal verbs of deduction used in our dialogue. These verbs help us express how certain we are about past events. Must have shows very high certainty, can't have shows certainty that something didn't happen, and might have shows possibility. We use these when we deduce or guess about past situations based on present evidence. Welcome to our New Concept English lesson! Today we'll learn from a realistic dialogue about a traffic stop. This conversation contains many useful phrases and grammar patterns that you'll encounter in everyday English. Pay attention to the modal verbs and expressions used by each character. In the first part, notice how Ann alerts Harry using present continuous: 'That policeman's waving to you.' The policeman uses a rhetorical question for emphasis and 'must have been' to express strong certainty about past events. Harry responds with 'can't have been' showing impossibility. These modal perfect forms are very important in English. Let's focus on the important grammar structures. Modal perfect verbs like 'must have been' express different degrees of certainty about past events. 'Must have been' shows strong certainty, while 'can't have been' expresses impossibility. The past continuous 'I was doing' describes ongoing actions. These structures are essential for expressing opinions and making deductions about the past. Now let's continue with the second part of the dialogue. The policeman asks about the speed limit, and Harry admits he didn't see it, saying he must have been dreaming. Ann defends Harry, and the policeman asks for documents. Finally, the policeman shows mercy but gives strong advice using 'you'd better not', which is a common way to give warnings in English. The dialogue concludes with Harry promising to be more careful, and Ann reminding him about her previous advice. Notice the use of 'I'll certainly' to make strong promises, and 'you'd better' for giving advice. This dialogue teaches us polite ways to admit mistakes, give warnings, and make promises. These phrases are very useful in real-life English conversations. Now let's practice what we've learned! Try completing sentences with modal verbs like must, might, and can't. Practice giving advice with 'you'd better' in different situations. Make deductions about past events using the patterns from our dialogue. Finally, role-play similar conversations in various contexts like doctor visits, school meetings, or workplace discussions. Remember, practice makes perfect in language learning!