Making deductions about the past at the B2 level! Let's explore:
*Must have + past participle:* used for deductions about the past that are considered certain.
- "She must have forgotten her phone at home."
- "They must have taken the wrong turn."
*May/Might have + past participle:* used for deductions about the past that are possible but not certain.
- "He may have left early to avoid traffic."
- "They might have gone to the movies."
*Can't have + past participle:* used for deductions about the past that are considered impossible.
- "She can't have eaten all that cake by herself!"
- "They can't have arrived already; they're not here."
*Practice Time!* Can you make deductions about the past using these examples?
1. Your friend is late, and you think they got lost.
2. You see a broken vase, and you think your sister knocked it over.
3. Your colleague is not answering their phone, and you think they're in a meeting.
To make deductions about the past at a B2 level, use modal verbs like must, can't, might, may, could, followed by have and the past participle (e.g., "must have gone"). Use must have for strong certainty, can't have for strong disbelief, and might have, may have, or could have for uncertain but possible events.
Certainty:
- Must have + past participle: Use when you are sure something happened, based on evidence.
- Example: "Sheila got a great tan. She must have spent a lot of time in the sun".
- Can't have / Couldn't have + past participle: Use when you are sure something did not happen.
- Example: "Amy can't have left because her coat is still here".
Possibility:
- Might have / May have / Could have + past participle: Use when you think something is possible but are not certain.
- Example: "The cupcakes are gone. My brother might have eaten them".
- Example: "There's a lot of blood on the street. There may have been a fight".
- Might not have / May not have + past participle: Use for a negative possibility.
- Example: "She might not have heard us; we should knock again".
Criticism or Regret:
- Should have / Ought to have + past participle: Use for situations that were expected but didn't happen, often to criticize.
- Example: "He should have studied more for the exam".

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