The answer is a definite NO!
What about if the person asking is your three years old daughter?
Ita vero Psittacum Ebrium, minime!!!
Probably the "question via intonation" was common: "Me lavare potes?"
Maybe orally, but when we write in Latin, no. They didn't have "?" in Latin, so no way to differentiate a question.
Is the -ne or some kind of question word required by Duo for questions?
The -ne is necessary for yes/no questions only.
If you have a "question word" (like ubi , quo , cur , quis , quid , etc.), you don't need -ne. (Note that the -ne is already "attached," in Nonne . Another way of starting a question is Num .)
(In context, if it's a question, even a rhetorical question, that will be obvious. But it's okay if Duo needs to see the -ne !)
Is the word order important? I got marked wrong when I put potesne at the end
Yes, it makes sense that the question-marking element ( -ne) would come at the beginning of the question.
Hoc certe pendet, quis me roget. :-)
Me lavare potesne?
I think it's important to signal the question, by putting -ne on the first word in the sentence. "Mēne lavāre potes?"
Why doesnt "Potesne tu me lavere" work?
It's an "a" verb, not an "e" verb: you need to say lavāre .
Ah, yes this is one of those practical sentences
Is this an ancient pick-up line?