In a technical manual, which sentence correctly uses a modal auxiliary to express past inability due to equipment failure?
Answer and explanation
Correct answer: B. The pump could not maintain sufficient discharge pressure
- Step 1: 'Could not' expresses past inability or failure of physical capacity. Answer: The pump could not maintain sufficient discharge pressure. Why not the others: 'might not' denotes past or present uncertainty, 'should not' expresses negative advisability, and 'must not' denotes prohibition.
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