(a) Why this lesson exists
You "know" the cases — you've chanted the paradigms for years. But on the exam, cases aren't trivia ("what case is morti?"); they're navigation. A genitive tells you a noun phrase isn't finished. A dative early in a sentence promises someone will gain or lose by the verb. An ablative without a preposition opens a how/why/when slot the verb must close. Strong readers don't identify cases after translating — they predict from cases while reading. That reflex is this lesson.
The signal table (the only paradigm this course will make you stare at):
| When you hit… | Predict… | The exam tests it as… |
|---|---|---|
| genitive | it leans on a nearby noun — phrase not finished | "Troiae depends on which word?" |
| dative | an interested party: gain, loss, possession, agent (w/ gerundive) | "mihi is dative of…?" |
| accusative, no preposition | direct object — or (poetry) place-to-which; or extent; or subject of an infinitive coming | "Why is gloriam accusative?" (indirect statement!) |
| ablative, no preposition | means, cause, manner, time-when, comparison, absolute | "the function of fato is…" |
| locative (Miseni, Romae, domi) | the old place-where case hiding in plain sight | sight-passage trap |
(b) The constructions, drilled on your actual syllabus
Every sentence below is unadapted from texts you must read anyway. Work each one before checking the key.
Set 1 — Pliny, Ep. 6.16.4 (the Elder's last ordinary afternoon):
Erat Miseni classemque imperio praesens regebat. Nonum Kal. Septembres hora fere septima mater mea indicat ei apparere nubem inusitata et magnitudine et specie.
1. Miseni — case and function. (Hint: it is not genitive, despite appearances.) 2. imperio — case and function with regebat. 3. hora fere septima — case and function. Why no preposition? 4. ei — case and function; who is meant? 5. inusitata et magnitudine et specie — case and function; what does this phrase describe?
Set 2 — Ep. 6.16.7 (the scholar almost stays home):
Iubet liburnicam aptari; mihi si venire una vellem facit copiam; respondi studere me malle.
6. mihi … facit copiam — what is mihi doing? 7. studere me malle — two infinitives and an accusative walk into a clause. Sort out who does what. (Preview of L4.)
Set 3 — Ep. 10.37.1–2 (Pliny reports a failed aqueduct to Trajan):
In aquae ductum, domine, Nicomedenses impenderunt HS XXX CCCXVIII … Ipse perveni ad fontem purissimum, ex quo videtur aqua debere perduci … arcuato opere, ne tantum ad plana civitatis et humilia perveniat.
8. aquae — case and function in in aquae ductum. 9. domine — case and function. What does its presence tell you about Book 10's register? 10. arcuato opere — case and function ("by means of…?").
Set 4 — Vergil, Aeneid 1.1–7 (yesterday's proem, now as case practice):
11. vi superum (line 4) — both words: case and function. (superum is a syncopated form — of what?) 12. Latio (line 6, inferretque deos Latio) — case and function. Two defensible answers exist; give one and name the other.
(c) The trap gallery (memorize these three)
- The genitive-lookalike: Miseni, Romae, domi are locatives ("at Misenum, at Rome, at home"), not genitives. Sight passages bait this constantly: a "genitive" with nothing to lean on is probably a locative or a dative in disguise — re-read.
- The naked ablative pile-up: Pliny loves stacking ablatives (inusitata et magnitudine et specie) — resist assigning each a different function; they often share one (here: description/quality).
- The poetic accusative: Italiam … venit (no ad). Prose gives you the preposition; poetry deletes it. When an accusative of a place follows a motion verb in verse, supply the arrow.
(d) Summary drill (skill 1.C — every lesson, forever)
In one English sentence each, summarize: (i) Ep. 6.16.4 (Set 1's two sentences together); (ii) Ep. 10.37.1–2 (Set 3's gist — what happened to the Nicomedians' money, and what does Pliny propose?).
(e) Answer key
1. Locative — "he was at Misenum." Old place-where case for towns, small islands, domus, rus. The exam's favorite false genitive. 2. Ablative of means/manner with regebat: "he was commanding the fleet with active authority / in person by his imperium." (praesens — nominative, "in person" — sharpens it.) 3. Ablative of time when: "at about the seventh hour." Time-when takes the bare ablative; duration takes the accusative. No preposition is the signal, not an omission. 4. Dative indirect object with indicat: his mother points out to him (= Pliny the Elder, the uncle). 5. Ablative of description/quality: a cloud "of unusual size and appearance." One function shared across the stacked nouns (see trap gallery). 6. Dative of interest/advantage with facit copiam: "he grants to me the opportunity (to come along), if I wished." Pliny the Younger declined — to do his homework. History's most consequential study session. 7. Indirect statement after respondi: subject-accusative me, head infinitive malle, with studere as its complement: "I replied that I preferred to study." Full treatment in L4. 8. Genitive dependent on ductum: "for a conduit of water" — an aqueduct. Genitive = the phrase isn't finished; aquae leans on ductum. 9. Vocative — "lord/Sir." Every Book 10 letter to Trajan carries it: official correspondence, deferential register. (Expect a Q1-style context question on exactly this.) 10. Ablative of means: "by arched work" — i.e., on arches. Concrete engineering ablatives fill Book 10. 11. vi — ablative of cause/means: "by the violence (of)…"; superum — genitive plural (syncopated superorum), dependent on vi: "of the gods above." 12. Dative of direction/goal with a compound verb (inferret): "carry the gods into Latium" — poetry's dative where prose would say in Latium. Defensible alternative: dative of advantage ("for Latium"). Name both; prefer direction. ⭐ Naming a defensible alternative is an AP skill — the exam writes distractors out of them.
Summary models (d): (i) "Stationed at Misenum in command of the fleet, Pliny the Elder is alerted by his sister to a strange cloud of unusual size and shape on the early afternoon of August 24." (ii) "Nicomedia has wasted enormous sums on two abandoned aqueducts, so Pliny proposes finishing the job properly from a clean source on arches, reusing the old stonework."
⭐ Exam strategy: in sight passages, the fastest comprehension gains come from datives and bare ablatives — they tell you the shape of the event (who's affected, by what means) before you've even resolved the verb. Train the prediction: case first, translation second.