They built this temple 3,000 years ago. This must ______ a great civilization.

Appeared in: UPUMS Nsg.Officer-2024

Explanation

The sentence requires a verb phrase to follow the modal verb 'must' to make a logical deduction about a past event ('3,000 years ago').
The correct grammatical structure for making strong deductions or expressing certainty about the past is 'modal verb + have + past participle'.
'have been' fits this structure perfectly, as 'have' is the required auxiliary and 'been' is the past participle of the verb 'be'.
The resulting sentence, 'This must have been a great civilization,' is a logical conclusion based on the evidence that a temple was built so long ago.

Option A: A modal verb like 'must' must be followed by the base form of a verb (e.g., 'be'), not a past tense form like 'was'. The structure 'must was' is grammatically incorrect.
Option C: Modal verbs are always followed by the base form 'have', regardless of the subject. 'Has' is the third-person singular present tense form and is never used after a modal verb.
Option D: While this option follows the correct grammatical structure for a negative deduction, it is logically incorrect in this context. The evidence (building a temple) strongly supports a positive conclusion about the civilization's greatness, not a negative one.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Modal verbs of deduction for past events as background academic context rather than a clinical decision trigger.
Clear and precise communication is vital in nursing for accurate patient documentation, handovers, and explaining conditions to patients and families. Misusing verb tenses can create ambiguity about when events occurred.
What if? If a nurse wrote in a patient's chart, 'The patient must be in pain yesterday,' it would be grammatically incorrect and confusing. The correct form, 'The patient must have been in pain yesterday,' clearly communicates a deduction about a past state, which is crucial for continuity of care.

How to Approach the Question

First, analyze the sentence to identify the time frame. The phrase '3,000 years ago' clearly indicates a past event.
Next, recognize that the word 'must' is a modal verb used here to express a strong deduction or certainty.
Recall the grammatical rule for making deductions about the past: modal verb + have + past participle.
Evaluate each option against this rule. 'was' and 'has been' are grammatically incorrect because they do not follow the base verb 'have' rule.
Finally, choose between the remaining grammatically correct options ('have been' and 'not have been') based on the logical context. Building a temple implies greatness, so the positive form is the logical choice.

Concept Tested & Keywords

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