"I want to change my dollars into euros."
Translation:Mi volas ŝanĝi miajn dolarojn en eŭrojn.
Why should we say "en eŭrojn" instead of "en eŭroj"? "Dollars" is indeed in the accusative position, since it is the direct object of "ŝanĝi", so we should say "dolarojn", but why "eŭrojn"? I would appreciate your explanation :)
There are a number of prepositions that can take either nominative or accusative depending on whether they express location or movement (similar to German). Accusative is used for movement.
Here, you have metaphorical movement of the dollars INTO euros (not that in English we use the movement form "into" rather than the location form "in"), hence the use of the accusative with "en".
Seems to me that ŝanĝi logically takes the preposition en + accusative, just like in English "change into". In the commonly found "change to", the "to" is really just short for "into" (sense 4 and not 1 in the Wiktionary entry for "to" https://en.wiktionary.org/wiki/to#Preposition )
Thus, it really should not be "al" in Esperanto.
Are you sure you're not applying your own grammar on Esperanto with your idea of translative? Most languages express translative not with a case, but with prepositions. Why should that necessarily be "to" and not "into"? Translative in English is certainly expressed with into, and if it uses to, it is in sense 2 (into) in Wiktionary, not 1 https://en.wiktionary.org/wiki/in#Preposition
"Al", on the other hand, unlike English "to" isn't a shortening of "into", and should not be used in cases where English can replace "to" with "into".
While Zamenhof uses "en" for inside whether a physical location or a length of time, he also uses it for an outside location which doesn't have any inside-ness, just a location-ness. He also uses it for abstract things like being in a certain mood — more an in-the-state-of than an inside-ness.
Also, the sentence does not speak of moving anything into a Euro coin or note. Money is an abstract concept. The perceived value of money can be in the abstract of the currency Euros or Dollars.
I know I prefer my money to be in pounds.
So, why "al"? I still haven't seen any good arguments why "al" should be more correct than "en".
If anything, if it were to be anything else than "en" + accusative, should it not then be "je" since it seems to be unclear which preposition is best suited, thus invoking rule 14?
Anyway, it's an interesting point to be aware of, and if there are different established and frequently used alternatives that are accepted, then the most important thing might be to be consistent in which option to use in one's own writing.
No, I'm not sure :-) I would hesitate to say, that most languages express the translative with prepositions, but that's not the point. Anyway the question is, how to express the translative in E-o.
I checked PIV. It says for "ŝanĝi" item "3 Aliformigi: la feino ŝanĝis la citrolon en kaleŝon ; ili ŝanĝis maron en polderojn", i.e. en + accusative. Furthermore for "en" it says "(I- Prep. montranta:) La finan staton de ŝanĝiĝinta objekto, la rezulton de aliiĝo" with an example "traduki libron en alian lingvon".
I stand corrected.
Thanks for checking. I didn't think to check the PIV myself, though I have been reading the Fundamento to see how Uncle Zam =) does it.
I did know about the PIV a few weeks ago, just after I started learning, but the first few weeks of learning Esperanto a bilingual dictionary is a bit more useful (if often very confusing when it tries translating things into the inconsistencies of English).
Since it has been almost five weeks now, however, it is about time I start using the PIV instead.
Here are a couple of online dictionaries, which you might find useful.
The bilingual dictionary of Lernu (E-o ↔︎ several languages) gives you a rough a translation. By "rough" I mean, that the dictionary contains errors and there are no examples of use.
A little less user-friendly is Reta Vortaro (Revo), which is basically E-o to E-o, but it contains translations to some languages. This varies from word to word. It contains a lot of examples. There is a Iphone/Ipad app called PoŝReVo, which uses the same word base.
And then there is PIV, which is the authoritative source. No other languages, but examples of use, albeit a little less than in Revo (at least IMHO).