"Could anybody else answer?"
Translation:Ĉu iu alia povus respondi?
I translated "Could anybody else answer?" to "Ĉu iu alia povis respondi?" and it was rejected because DuoLingo wanted "povus" instead of "povis."
But I think "povis" should be allowed, because in English "could" can be the past tense of "can." Therefore "povis" should be an acceptable translation of "could" in this case.
> Ah, and could anyone else answer?"
Simply asking a question or using a negative isn't enough trigger the conditional. Notice that the answer to that question would take the plain past form.
Here's a better example:
> Today the maths teacher had a really difficult question! She should have given more hints!
> Ah, and could anyone else have answered?
We seem to be talking at cross purposes.
I do not deny that "could" can be conditional.
I merely wanted to point out that "could" can be simple past, non-conditional.
Although "could" in English is the past tense indicative of "can", in this situation "could" is in the subjunctive case
and I interpreted this situation to be Duolingo's sentence Could anybody else answer?
So I tried to come up with a context where this sentence could be used with a simple past meaning.
My point being that I disagree with your assessment that in this situation "could" is in the subjunctive case.
It can be in the subjunctive case, given the appropriate context, but it does not have to be.
So I think both povis and povus are reasonable translations into Esperanto, depending on the context.
Or are you trying to say that my "non-conditional, simple past" interpretation of "Could anybody else answer?" is impossible?
I agree that "povus" is possible.
However, "ĉu ... povus" would be used to ask a question about a hypothetical situation. Asking about what actually happened must be "povis."
This is different from English, which uses "could" for both.
Also, I should correct myself to "subjunctive mood" - not "case".
The problem (and one that I hope the new tree will address) is that -us really isn't a translation for the English looks-like-past-form subjunctive.
> I was hoping that you wouldn't notice.
> Mi esperis ke vi ne rimarkos.
And, likewise, an English future tense might be better translated to the conditional or volitional.
> I can't give a good explanation now, but I'll know it if I see it, and I'll let you know.
> Mi ne povas bone ekspliki nun, sed mi rekonus ĝin kiam vidi, kaj mi tuj sciigu vin.