Gerundive of Purpose or Obligation after 'misit'
English-to-Latin exercise, 20 sentences, each worth 3 marks. Sentence 14: 'The general sent three soldiers to guard the bridge.' A candidate writes: 'Imperator tres milites pontem custodiendum misit.' The teacher circles 'pontem custodiendum' and writes: 'Not wrong in every context, but not the standard construction here; also ambiguous.' The candidate had reasoned that the gerundive agrees with 'pontem' and expresses purpose. The class has just covered gerunds, gerundives, purpose clauses, and the supine. The teacher wants the candidate to distinguish (a) obligation, (b) purpose, and (c) result, and to see why English 'to guard' can be rendered by several Latin structures but not usually by a bare accusative gerundive after 'misit'. The candidate must revise the sentence twice, using two different acceptable constructions, and explain the difference in nuance.
1. Diagnose the problem with 'pontem custodiendum misit'. What readings are possible, and why is the intended purpose reading weak?
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'pontem custodiendum' is an accusative noun phrase: 'pontem' with the gerundive 'custodiendum' agreeing with it. A gerundive normally expresses obligation or necessity ('a bridge to be guarded') or purpose when governed by 'ad' or 'causa'. After 'misit', a bare accusative gerundive is not the regular purpose construction. It could be forced to mean 'he sent the bridge to be guarded', but that makes 'pontem' the object of 'misit', which is absurd in context. It could also be read as a complement describing the bridge as needing guard, not as the purpose of sending soldiers. The intended sense 'sent soldiers in order to guard' is not clearly encoded; the soldiers are object of 'misit' and the purpose is left loose. Hence ambiguity and weak idiom.
2. Rewrite the sentence using (a) ad + gerundive and (b) a purpose clause. Explain any difference in emphasis.
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(a) 'Imperator tres milites ad pontem custodiendum misit.' Here 'ad' + accusative gerundive (agreeing with 'pontem') is a standard purpose phrase: 'for the purpose of guarding the bridge'. (b) 'Imperator tres milites misit qui pontem custodirent.' The relative clause of purpose uses imperfect subjunctive after the secondary tense 'misit'. Difference: (a) is compact and presents purpose as the aim of the sending; (b) is fuller and makes the soldiers' intended action explicit. Both are correct. A third option, 'pontem custoditum', is possible as an accusative supine after a verb of motion, but it is ambiguous with the perfect passive participle and is less common with an explicit object.
3. Another candidate writes 'Imperator tres milites pontem custoditum misit.' Is this acceptable? What does it literally mean, and what restriction applies to the supine?
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It is defensible if 'custoditum' is taken as the accusative supine of 'custodio' after a verb of motion: 'sent ... to guard the bridge'. The supine in '-um' expresses purpose and is typically used after verbs of motion such as 'eo', 'mitto', 'venio'. It can take an object, so 'pontem' is fine. But the form 'custoditum' is identical to the masculine accusative perfect passive participle of 'custodio', so a reader may first parse 'pontem custoditum' as 'the guarded bridge' or 'the bridge having been guarded'. In an exam, that ambiguity is a risk. Use 'ad pontem custodiendum' or a purpose clause for clarity. The supine is not a general-purpose replacement for every English infinitive.