Not in French. We would say Ils la déclarèrent coupable. Literally, "They declared her guilty".

In Dutch it would mean that in their opinion she is guilty which is a bit different.

I was really confused about that too, thanks for explaining it.

So, you could say Ili trovis ŝin kulpi. then?

Thanks! Is the other sentence, 'ili trovis ke ŝi estas kulpa', legal? Trovi needs a direct object, can 'ke + clause' be counted as one?

But then, that's quite idiomatic. I don't know that any other language than English puts it that way. But then, I don't know most languages sufficiently well, of course...

That's a strange one... I would have thought "kulpigi" would be "to make someone guilty". But I guess in this case it makes sense to not be entirely regular in that regard. "Blame" is just a much more common thing to say.

That makes sense, thanks!

Your response got me thinking more about it, and I think I can add a little more clarification. Consider the English sentences:

• We painted the red door.
• We painted the door green.
• We painted the red door green.

When translating to Esperanto, if you were to use the words "ruĝan" and "verdan" for "red" and "green" respectively, how would you know which was the old color and which was the new color?

In English, we know which is which because of the word order. (That is, the old color comes before the noun; the new color comes after.) But given Esperanto's freer word order, we can't depend on word order itself, so we have to mark one color with "-n", and leave the other unmarked:

• Ni farbis la ruĝan pordon. (We painted the red door.)
• Ni farbis la pordon verda. (We painted the door green.)
• Ni farbis la ruĝan pordon verda. (We painted the red door green.)

Using both "ruĝan" and "verdan" in this last case would make the sentence "We painted the red green door" which is not what we want, and is also confusing.

This distinction is important when we use the verb "to name":

• Esperanto: Ni nomis nian bebon Bela.
• English: We named our baby Bella.

The name is the baby is not "Bela." Adding an "n" to "Bela" creates an adjective out of what's supposed to be a noun:

• Esperanto: Ni nomis nian bebon belan.
• English: We named our beautiful baby.

"Voki" ("to call") also works the same way:

• Esperanto: Mi vokis la knabon feliĉan.
• English: I called the happy boy.
• Another English translation: I called the lucky boy.

Compare to:

• Esperanto: Mi vokis la knabon feliĉa.
• English: I called the boy happy.
• Another English translation: I called the boy lucky.

So, back to the original sentence "Ili trovis ŝin kulpa." Let's modify it slightly to "Ili trovis la virinon kulpa" ("They found the woman guilty"). As is, it reads like this:

• Esperanto: Ili trovis la virinon kulpa.
• English: They found the woman (to be) guilty.

But add an "n" to "kulpa," and the meaning changes:

• Esperanto: Ili trovis la virinon kulpan.
• English: They found the guilty woman.

For that matter, you could change "kulpa" to "kulpe." Now we get a different meaning:

• Esperanto: Ili trovis la virinon kulpe.
• English: They guiltily found the woman.

We can even use all three forms in one sentence:

• Esperanto: Ili trovis la virinon kulpan kulpa kulpe.
• English: They guiltily found the guilty woman (to be) guilty.

(Can you see which form of "kulpa" corresponds to which form of "guilty"?)

Thanks again, traevoli. Your response was very helpful.

Thank you for the reply.
I did listen very closely & carefully, many times, but it always sounded the same. That is why I began to report it. And it was always the same male voice as I have/had been hearing all along.
It possibly could have something to do with the voice being sampled into a computer program that generates the pronunciation elements & assembles them into sentences.
I hope that Duolingo will look into this and try to correct the problem since this is not the only occasion I have encountered mispronunciations during the lessons. And in case this might be somehow related to my computer, I'm using a Mabook Pro with Mavericks plus Safari. Cheers!