"Esperanto speakers are speaking Esperanto in a café."

Translation: Esperantistoj parolas Esperanton en kafejo.

[idkhbtfm]

Is this some sort of a tongue twister?

[andybeals]

Se ili ne parolas esperante, kiel oni konas ke ili ja estas Esperantistoj?

[Eddygp]

Is Esperanta parolantoj an option?

[jxetkubo]

Esperantaj parolantoj, more common is Esperantoparolantoj.

[johmue]

Maybe "Esperanto-parolantoj."

[amuzulo]

Yes, with the hyphen is acceptable, but we don't accept it for this sentence, because Duolingo doesn't check punctuation and we absolutely cannot accept "Esperanto parolantoj" without the hyphen.

[deactivated user]

So I take it that the "tist" in Esperantistoj means person or something like that, right?

[phle70]

• esper'i is to hope

• -ant-
  denotes something called active present participle - "someone does something right now"
  (I wrote a longer comment on it in another post.)

• -ist- usually means someone working with this

• -o denotes the word being a noun

So: (with ' to mark the "word parts")
esper'ant'ist'o means
[hope, hoping] + [does this right now] + [this is "their job"] + [this word is a noun],
i.e. (my interpretation) "someone keeps the hope going"
i.e. an Esperantist.

[KonradKond8]

Esperanto bonas kaj belas :)