In technical communication, which sentence correctly uses a modal verb to express deduction based on strong evidence?
Answer and explanation
Correct answer: A. The motor casing is burning hot; there must be a bearing failure
- Step 1: 'Must' expresses logical deduction or certainty based on clear observed physical evidence. Answer: The motor casing is burning hot; there must be a bearing failure. Why not the others: 'should' and 'ought to' express expectation or advice, and 'can' expresses general theoretical possibility rather than deduction from present evidence.
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