SupraEnglish
Grammar
Grammar/Unit 4: Deduction (Must/Can't)

Vocabulary

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Deduction

/di-duk-shun/

"Logic guess."

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Evidence

/ev-i-dens/

"Proof."

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Certainty

/sur-ten-tee/

"Sureness."

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Impossible

/im-pos-uh-bul/

"Cannot happen."

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Probable

/prob-uh-bul/

"Likely."

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Conclusion

/kon-kloo-zhun/

"Result thought."

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Assumption

/uh-sump-shun/

"Guess."

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Logic

/loj-ik/

"Reasoning."

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Fact

/fakt/

"Truth."

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Mystery

/mis-tuh-ree/

"Unknown."

Article

Sherlock Holmes Mode 🕵️‍♂️

We use modals to guess based on evidence.

  1. Must be: 90-100% Sure it is TRUE.
    • "He has a Ferrari. He must be rich."
  2. Can't be: 90-100% Sure it is IMPOSSIBLE (False).
    • "She just ate lunch. She can't be hungry."
    • (Note: Opposite of 'Must be' is 'Can't be', NOT 'Mustn't be').
  3. Might/Could be: 50% Maybe.
    • "He might be French."

Practice

Progress: 0/10
Score: 0
1.

He drives a Ferrari. He ___ be poor.

2.

You worked all day. You ___ be tired.

3.

Someone is at the door. It ___ be the postman (Maybe).

4.

He is speaking German. He ___ be from Germany.

5.

She is not answering. She ___ be sleeping.

6.

The lights are off. They ___ be home.

7.

Logic: If A=B and B=C, A ___ equal C.

8.

That ___ be true! It's ridiculous.

9.

I lost my keys. They ___ be in the car.

10.

Opposite of 'Must be' (Deduction) is...

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