Gerund vs Gerundive
Two forms that look identical and mean opposite things. The gerund is a verbal NOUN — neuter singular, only oblique cases — that names the act itself: amandī "of loving," legendō "by reading." The gerundive is a verbal ADJECTIVE in every gender, number, and case, and it is PASSIVE: liber legendus "a book to be read."
The killer trap is that amandī, amandō, amandum could be either one. Caesar's cupiditas belli gerendī could be parsed as gerund ("desire of waging war") or gerundive ("desire of war-to-be-waged") — and Latin nearly always prefers the gerundive when there's a direct object in play.
That preference is called gerundive attraction, and once you see it you'll see it everywhere in Cicero and Caesar.
Learnings0 core · 1 AP claim
AP framework claims (1)— verbatim from AP CED
Gerund = "the act of V-ing" (active, takes object). Gerundive = "to be V-ed" (passive, agrees with a noun).
When the verbal noun would govern a direct object, Latin nearly always swaps in the gerundive (gerundive attraction): cōnsilium urbis capiendae instead of cōnsilium urbem capiendī.
| Case | Form | Use |
|---|---|---|
| Nom. | — | supplied by infinitive *amāre* |
| Gen. | am-andī | of loving |
| Dat. | am-andō | for loving |
| Acc. | am-andum | (to) loving |
| Abl. | am-andō | by/in/from loving |
| Case | Masc. | Fem. | Neut. |
|---|---|---|---|
| Nom. sg. | leg-endus | leg-enda | leg-endum |
| Gen. sg. | leg-endī | leg-endae | leg-endī |
| Dat. sg. | leg-endō | leg-endae | leg-endō |
| Acc. sg. | leg-endum | leg-endam | leg-endum |
| Abl. sg. | leg-endō | leg-endā | leg-endō |
| Plural | leg-endī, | leg-endae, | leg-enda, |
See It In Action
— B. G. i. 3
Pure gerundive attraction: instead of ad eās rēs cōnficiendum (gerund + acc. object), Latin makes the gerundive cōnficiendās agree with rēs — both go accusative under ad.
— B. G. i. 41
Read literally, belli gerendī is "of war to-be-waged" — but English wants "for waging war." The gerundive in the genitive is the standard way to express the object of a verbal noun.
— B. G. ii. 10
No object means no attraction — pugnandī stays a plain gerund ("of fighting"). The phrase X-ndī causā is one of Caesar's go-to purpose constructions, alongside ad + gerundive.
— Iug. 46
A textbook ablative of means with the gerund — and notice the gerund pollicendō governs a neuter accusative multa directly. A&G §504. a notes the gerund retains an accusative object only when that object is a neuter pronoun or adjective.
Amandī, amandō, amandum could be either. The deciding question is whether there's a noun the form agrees with — and whether the meaning is active or passive.
neut. sg., active, names the act — "V-ing"
ars scrībendī
the art of writing
agrees with a noun, passive — "to be V-ed"
epistula scrībenda
a letter to be written
Tip: Ask: does -nd- AGREE with a noun in gender, number, and case? If yes → gerundive. If it's standing alone in the neuter singular → gerund. And if you see a direct object in the same case as the -nd- form, that's gerundive attraction in action.
In Caesar's ad eās rēs cōnficiendās biennium sibi satis esse dūxērunt, what is the grammatical job of cōnficiendās?
Study Tips
- •When you see -ndī, -ndō, -ndum with NO accompanying noun, it's almost always the gerund — translate "of/by/to V-ing."
- •When you see -ndus, -nda, -ndum AGREEING with a noun, it's the gerundive — translate the noun + "to be V-ed," then re-cast in smooth English ("for V-ing X").
- •Memorize causā and grātiā with the genitive — they're the two highest-frequency purpose constructions in classical prose.
- •If you spot ad + accusative -ndum/-ndam/-ndōs phrase, it's purpose: "in order to V." Caesar leans on this construction constantly.