Gerundive with Curavit versus Passive Periphrastic
In a Latin II diagnostic, 31 students translate "Dux militibus pontem faciendum curavit." Twenty-four write, "The general must build a bridge for the soldiers." Six write, "The general had a bridge built for the soldiers." One writes, "The general must have a bridge built by the soldiers." In a department meeting, two teachers disagree: one marks all 24 wrong, the other says "must" is an acceptable paraphrase because the gerundive carries obligation. Several students circled faciendum and labeled it a future passive participle, and no one commented on curavit. The class has already studied gerundives and the passive periphrastic with sum. You are asked to produce a short diagnostic explanation and a follow-up item that isolates the confusion without introducing new vocabulary.
1. What is the correct syntax of "pontem faciendum curavit," and why is "must build" a misreading?
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Curavit is an active perfect verb meaning "saw to" or "had [something] done." Faciendum is a gerundive agreeing with pontem in accusative masculine singular; it is the object complement of curavit, not a predicate with a form of sum. The phrase means "had a bridge built" or "saw to it that a bridge was built." The gerundive does contain a notion of obligation or fitness, but that force is not activated predicatively here because there is no est/sunt and no dative of agent construction. "Must build" wrongly converts an active verb of procurement into a passive periphrastic and makes the general the builder. Militibus is dative, most naturally "for the soldiers," though context could make it agent-like; that ambiguity should be discussed separately. The diagnostic point is that faciendum agrees with pontem, and curavit-not an omitted est-controls the construction.
2. Construct a minimal pair that distinguishes the two constructions and explain the difference in form and meaning.
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Minimal pair: (1) Dux militibus pontem faciendum curavit. (2) Pons militibus faciendus est. In (1), faciendum modifies pontem and depends on curavit: "The general had a bridge built for the soldiers." In (2), faciendus is nominative singular agreeing with pons and is joined to est: "The bridge must be built by the soldiers." The passive periphrastic requires a form of sum and expresses obligation or necessity; the dative militibus is the agent. The first sentence has no sum and uses an active main verb of causing. A second useful contrast is Dux pontem facit, "The general builds the bridge," which lacks both the gerundive and the obligation. The pair isolates agreement, the presence or absence of sum, and the semantic role of the dative.
3. What follow-up item would you use, and what misconception would it diagnose?
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A good follow-up is a forced-choice parsing task: "In Dux pontem faciendum curavit, what does faciendum modify, and what does curavit contribute?" Students must answer that faciendum modifies pontem and that curavit supplies the main predication "had built." A second item could ask students to translate two short sentences-Pons faciendus est and Pontem faciendum curavit-and label the function of each gerundive. This diagnoses whether students are treating every gerundive as a passive periphrastic automatically or whether they can distinguish attributive/object-complement use from predicative use with sum. It also reveals whether they are ignoring the main verb, which was the original error. The item uses known vocabulary and targets the exact confusion rather than adding new morphology.