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For instance, if you say, "I came here to eat," or "We want something good to eat," you are using the infinitive "to eat" to express reason or purpose. How do translate something like this in Latin?

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In Latin, the infinitive is not used to introduce a reason, or "purpose clause" as a Latin grammar would put it. Here are some other options, which I will gear toward the (very broad) use case of English translations using the infinitive with a sense of purpose.

  1. Ut + Subjunctive

ut means "that, in order that" and introduces a subordinate purpose clause. The negative of a purpose clause is ne. An example:

Loquor ut meminerim.

I speak to remember.

  1. Ad + Accusative Gerund

Ad pugnandum aggreditur.

He comes forward to fight.

  1. Genitive Gerund + Causa

Debellandi causa venit.

He comes to conquer.

  1. Gerundive Participle with object

This one is a bit tricky: if you are speaking of an object on which something "ought to be done," you can modify that word with a gerundive. This applies well to your second example sentence:

Aliquid boni edendum volo.

I want something good to eat.

(This translation might be made better...comments welcome.)

  1. And my favorite... the supine!

The supine is an oft-disregarded form that, for most intents and purposes, is the same as the neuter singular passive participle. It is quite common in everyday speech (just read Plautus and see it appear every page) and expresses purpose with verbs of motion. This translates your first example well:

veni esum/laudatum/plausum.

I came to eat/praise/applaud.

  • In case it isn't clear: this list is not exhaustive :) – brianpck Aug 27 '16 at 1:59
  • "Good to eat" can (also) be rendered with a different case of the supine, the ablative: bonum esu. (I'm not sure about Aliquid boni edendum volo -- it strikes me as somehow off, but I may well be wrong.) – TKR Aug 27 '16 at 2:25
  • Excellent overview! One more thing: in poetry, the infinitive can be used. – Cerberus Aug 27 '16 at 4:08
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The answer above is pretty comprehensive! I don't yet have the reputation points to make this into a comment, rather than a full answer, but there are a few things worth adding.

First, In the case of Aliquid boni edendum volo — I think the most literal translation would be: "I desire something of good having-to-be-eaten." boni is then a partitive genitive. I think edendeum is really the future passive participle, since the accusative of the gerund will usually want ad to express purpose, as noted in the answer. But they are morphologically identical.

Also note that the accusative of the supine is most commonly used with verbs of motion (eo, ire, venire, et cetera).

  • 1
    Valuable information! Perhaps it isn't wholly in the format of an answer, but it wouldn't fit in a comment anyway, so I think this is the right format for now (of course you could edit it a bit and add more information flesh it out, but that's up to you). One little thing: you seem to have misread Brian's "gerundive" for "gerund": he isn't talking about gerunds. What you call the "future passive participle" is usually called "gerundive", but it is the same thing. – Cerberus Aug 27 '16 at 4:11
  • Yes, I mentioned it in passing but it's worth emphasizing that the supine only works with motion verbs. You can't say cano laudatum for "I sing to praise" – brianpck Aug 27 '16 at 16:42
  • Cerberus, I was taught to think of the future passive participle as something distinct from the gerundive — that may, however, be a quirk of the teachers I studied with. – Max Aug 28 '16 at 2:39
  • Some textbooks (e.g. Keller and Russell) distinguish the gerundive from the future passive participle, others use the terms synonymously. – TKR Aug 28 '16 at 17:01
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As the point of departure for this question was the English phrase “I came here to eat”, it might be worth mentioning that in this construction “to eat” is not (at least historically) an infinitive, but the preposition “to” with the Old English dative of a verbal noun. Structurally it is thus more like Latin “ad edendum” (preposition plus accusative gerund).

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    Yet another reason why I want to learn Old English... – brianpck Aug 28 '16 at 13:26
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    @brianpck. Sadly, the texts are rather dreary compared with those in Latin. – fdb Aug 28 '16 at 20:24

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