4. Structure • Level 2
Deduction (Present)
10 Questions • 3 Minutes
📖 Lesson: Deduction (Present)
Must Be (90-100% Sure)
- "He has a Ferrari. He *must be* rich." (Logical conclusion).
Can't Be (90-100% Impossible)
- "He is eating. He *can't be* dead." (Logic says no).
- Note: Do not use 'mustn't be' for deduction.
Might / Could / May (50% Maybe)
- "Where is John? He *might be* at home." (I am not sure).
Summary
- Sure YES: Must be.
- Sure NO: Can't be.
- Unsure: Might be.
📋 Practice Questions
10 questions from this quiz — preview them here, then take the interactive quiz above. Your full answer review with explanations unlocks when you finish the test.
1. He has a Ferrari. He _____ rich.
- Amust be
- Bcan't be
- Cshould be
- Dneeds be
2. That _____ be John. John is in Paris.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
3. Answer the phone. It _____ be Mom.
- Acan
- Bcould
- Cmust
- Dneeds
4. She isn't eating. She _____ be hungry.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
5. It _____ rain later.
- Amust
- Bmight
- Ccan
- Dneeds
6. He plays piano well. He _____ practice a lot.
- Amust
- Bcan
- Cshould
- Dneeds
7. It _____ be true! I don't believe it.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
8. Where is Ann? She _____ be at work.
- Amust
- Bcan
- Cshould
- Dneeds
9. That _____ be easy. It looks hard.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
10. He _____ know the answer.
- Amust
- Bmight
- Ccan
- Dshould
🔗 Keep Practicing
✅ Answer Review
Nice work finishing the test — here is every question with the correct answer and explanation.
1. He has a Ferrari. He _____ rich.
- Amust be
- Bcan't be
- Cshould be
- Dneeds be
Correct answer: A) must be
Logical conclusion.
2. That _____ be John. John is in Paris.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
Correct answer: B) can't
Impossible.
3. Answer the phone. It _____ be Mom.
- Acan
- Bcould
- Cmust
- Dneeds
Correct answer: B) could
Possibility.
4. She isn't eating. She _____ be hungry.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
Correct answer: B) can't
Logical deduction.
5. It _____ rain later.
- Amust
- Bmight
- Ccan
- Dneeds
Correct answer: B) might
Possibility.
6. He plays piano well. He _____ practice a lot.
- Amust
- Bcan
- Cshould
- Dneeds
Correct answer: A) must
Certainty.
7. It _____ be true! I don't believe it.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
Correct answer: B) can't
Disbelief.
8. Where is Ann? She _____ be at work.
- Amust
- Bcan
- Cshould
- Dneeds
Correct answer: A) must
Assumption.
9. That _____ be easy. It looks hard.
- Amustn't
- Bcan't
- Cshouldn't
- Dmay not
Correct answer: B) can't
Deduction.
10. He _____ know the answer.
- Amust
- Bmight
- Ccan
- Dshould
Correct answer: B) might
Possibility.