"Would you like to have something else? Perhaps a cup of coffee?"
Translation:Haluaisitko vielä jotain? Ehkä kuppi kahvia?
The problem doesn't lie with jotain/jotakin (which are the same thing, source [fi]) or muuta, but with the conjugation. Let me explain.
As sentences, Haluaisitko jotain muuta? and Ehkä kuppi kahvia? are grammatically correct independently. But now when Ehkä kuppi kahvia? per itself lacks the predicate and references it in the preceding sentence (haluaisitko), it has to respect haluaisitko's conjugation.
The second sentence expanded now is Haluaisitko ehkä kuppi kahvia? which is grammatically incorrect because kuppi is not in right case with haluaisitko; it should be Haluaisitko ehkä kupin kahvia?
Confusion may arise because in this case the meaning of the sentence saisiko olla jotain muuta is quite equivalent to haluaisitko jotain muuta. In this case, saisiko olla requires kuppi and the complete correct sentence is Saisiko olla ehkä kuppi kahvia?
Important in the translation is also the politeness word "would" because it calls for conditional mood. This is indicated in Finnish by the marker -isi-. Haluatko would translate as "do you want".
Haluaisitko kuppi kahvia is wrong, haluaisitko kupin kahvia correct.
Saisiko olla kuppi kahvia is correct, saisiko olla kupin kahvia is wrong.
Replying to your question epingchris (because the forum doesn't allow any higher level replies):
Conditional per itself does not affect the case; it's defined by the base verb. Let's go explore this thing a bit.
Haluta requires partitive:
- haluatko kahvia? – do you want some coffee?
- haluan kahvia – I want some coffee.
The conditional mood, usually made just by adding -isi- in the middle of the word, behaves similarly:
- haluaisitko kahvia? – would you like some coffee?
- haluaisin kahvia – I would like some coffee.
In my example the other construct, saisiko olla behaves similarly if there's only the uncountable noun (kahvi):
- saako olla kahvia? – can I get you some coffee? (lit. "can there be some coffee")
- saisiko olla kahvia? – could I get you some coffee?
The conditional form of saako is saisiko (nominative saada).
When you count the uncountable noun using something, the countable and uncountable noun may behave differently. Now there's kuppi which is countable and behaves differently between haluta and saada.
- halua[isi]tko kupin? – do you want [/would you like] a cup?
- halua[isi]n kupin – I want [/would like] a cup.
- saako [/saisiko] olla kuppi? – can [/could] I get you a cup?
So by combining these two we get:
- kuppi kahvia (a cup of coffee, nominative)
- kupin kahvia (a cup of coffee, genitive)
And we arrive here, where different verbs require different forms and the conditional doesn't affect them:
- halua[isi]tko kupin kahvia?
- saako [/saisiko] olla kuppi kahvia?
Kinda long answer, but I hope I managed to clear things a bit.
On other notes, I slightly feel I'm nitpicking too much and regret it because I think it potentially just adds unnecessary confusion at this point. But then, teaching people wrong would feel even worse.
Just to make sure I've got this: does it mean that when the verb is in conditional mood, the object needs to be in accusative (genitive)? Because I seem to remember that up till now "haluta" has been followed by partitive: "Haluan kahvia"...please correct me if I was mistaken.
Even though they are translations of the same English sentence, I notice a slight difference: "Haluaisitko vielä jotain?" is the "Would you like to have something else?" after ordering food or after dinner.
"Haluaisitko jotain muuta?" or even better, "Saisiko olla jotain muuta?" is the "Would you like to have something else?" when the customer can't have his/her first choice for whatever reason or can't have the same thing everyone else has ordered. These questions can be used also in the first scenario, but here's the difference I found.
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Volgav vitsenanieff nivya kevach varatsach.