Grammar Games Speed Round
Modals of Deduction Game
Read the evidence, then show how sure you are.
READY WHEN YOU ARE
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No sign-up. Just a quick round and the corrections that matter.
Keep learning
Play first. Understand every answer.
The round is short; the corrections are the lesson. Use the guide below whenever you want a refresher.
How to play
- Choose Practice for an untimed round, or Challenge for twelve timed questions and three lives.
- Practice lets you choose a difficulty; Challenge mixes all three levels.
- Read each correction and continue with the related exercise.
Grammar guide
Modals of Deduction Game: rules and examples
Use must for a strong conclusion from evidence, might for a possibility, and can't when evidence rules something out. For the past, add have + past participle.
01
Present evidence
Must be expresses a strong conclusion, might be an uncertain possibility, and can't be an impossible present conclusion.
Her voice is in the kitchen. She must be home.
The voice is strong evidence.He can't be in Paris; he is beside me.
The evidence rules Paris out.
02
Past evidence
Use modal + have + past participle for a deduction about an earlier event.
The ground is wet. It must have rained.
A strong conclusion about the past.She might have missed the bus.
One possible past explanation.
03
Match certainty to evidence
Direct contradictions support can't. Strong clues support must. If you are unsure or have several possible explanations, use might.
The museum was closed. They can't have visited it.
Closure rules out the visit.I cannot find my keys. I might have left them at work.
That is possible but unconfirmed.
FAQ
Is this modals of deduction game free?
Yes. Practice and Challenge are free without an account.
What is the difference between must and might?
Must gives a strong conclusion from evidence. Might gives a possible explanation that is not certain.
Does can't mean impossible here?
Yes. It says the evidence rules out that conclusion.
How do I make a deduction about the past?
Use must, might or can't + have + past participle.
Can I use this game in class?
Yes. Ask learners to state the evidence before selecting a modal.
Is my score saved?
Your best Challenge score is saved in this browser, not your account.