Solving mysteries: making deductions about the past

Summary

This 90-minute ESL lesson for B2 learners explores Solving mysteries: making deductions about the past through a real audio recording. Across 11 interactive exercises, you'll develop listening comprehension, vocabulary, grammar, practical communication, speaking skills — all built around authentic English content.

What you'll practise:

• 5 key vocabulary items with definitions and usage notes
• Grammar focus: Modals of deduction for past events with examples and practice
• Real-world phrases for figuring out a work problem
• Gap-fill and cloze exercises to test vocabulary in context
• Matching exercise to connect terms with their meanings
• Error correction to sharpen grammar awareness
• A reading passage to practise newly learned language

Lesson activities (11 exercises)

Each exercise builds on the previous one. Work through them in order for the best learning experience.

1. Warm-up — Discussion questions to activate what you already know about the topic.
2. Comprehension — Answer questions to check your understanding of the main ideas and supporting details.
3. Vocabulary — Learn key words and expressions from the audio recording, with definitions and usage notes.
4. Matching — Connect words, phrases, or concepts to their correct counterparts.
5. Grammar — Study Modals of deduction for past events — explanation, examples, and key rules.
6. Error correction — Find and fix the mistake in each sentence — a great grammar workout.
7. Practical English — Learn phrases for figuring out a work problem — ready to use in real conversations.
8. Fill the gaps — Complete sentences with the correct vocabulary. Drag and drop or type your answers.
9. Reading — Read a short passage on the topic and answer comprehension questions.
10. Discussion — Reflect on the topic and share your opinions using the language you've learned.

Vocabulary

This lesson introduces 5 key terms drawn directly from the audio recording:

• To piece together the evidence — to gradually understand a situation by collecting and combining different pieces of information.
• A red herring — a clue or piece of information that is misleading or distracting from the real issue.
• To rule out (a possibility/a suspect) — to eliminate something as a possibility or decide that someone is not responsible.
• An inside job — a crime, especially a theft, committed by someone with internal knowledge, like an employee or resident.
• To have a hunch — to have a feeling or guess based on intuition rather than facts or proof.

Grammar

This lesson focuses on Modals of deduction for past events.

We use modal verbs like 'must have', 'can't have', and 'might have' followed by a past participle to make logical guesses about past events. When investigating a mystery or discussing a past situation, these verbs help us express how certain we are about our conclusions based on the available evidence.

Examples from the lesson:

• The lights in the house are off and the car is gone. They must have left for their holiday already. — Use 'must have + past participle' when you are almost certain something happened based on strong evidence.
• He was seen in London at noon. He can't have committed the crime in Paris at one o'clock. — Use 'can't have' or 'couldn't have + past participle' to express that you believe something was impossible.
• The detective found a footprint in the garden. The culprit might have escaped through the back window. — Use 'might have', 'could have', or 'may have + past participle' to suggest a possibility when you are not sure.

Key rules:

• Structure: modal (must/can't/might) + have + past participle.
• These modals express degrees of certainty about the past, not obligation or ability.
• Common mistake: avoid using 'mustn't have' for deduction. The correct negative form is 'can't have' or 'couldn't have'.

Practical English

figuring out a work problem

In a professional setting, you often need to discuss why something went wrong. These phrases will help you speculate about the causes of a problem, propose theories, and discuss evidence with your colleagues.

Phrases you'll learn:

• "I'm trying to get to the bottom of why..." — to introduce the problem you are investigating.
• "All the signs point to..." — to present a conclusion that seems very likely based on the evidence.
• "I'm wondering if..." — to gently propose a possible explanation.
• "That would explain why..." — to show that a theory logically explains another known fact.
• "I'm not so sure that's the case, because..." — to politely disagree with someone's deduction.