I can only hear the woman's voice, and not the man's, but at least for that voice the "des" seems clear to me.
Another vote for "are you reading letters? Which ones?" This seems a pretty basic acceptable alternative, as well as the one below in another post: "do you read letters? Which ones?"
cant make out the difference between des and les , this voice is very hard to follow in most cases.
I thought the voice said 'les' too at spoken speed, I could only hear des at the slow speed. Should I have known that anyway as a numerical reference?
When you hear the sentence, how can you tell it is singular (i.e., de lettre) or plural (i.e., des lettres)
De and des are pronounced differently. De is like 'duh' and des is like 'day'. Or more precisely, de is \də\, des is \de\
I wrote word for word what I heard despite the sentence confused me. That is the lesson. The DUO 'robo' fortunately does not recognize punctuation marks... yet. I omitted all punctuation and it was marked correct.
Unfortunately punctuation is not a priority for the program at this time. Sometimes it doesn't matter much, but sometimes it does...
I have also heard les. Also I have put lequelles how is lesquelles different if anybody had a good explanation merci
It's lesquelles, plural feminine. Lesquels is a homophone, but it is plural masculine, so you know that won't work for a feminine word like lettres.
"You are reading letters, which ones?" why is this not acceptable? As a listening comprehension exercise it was impossible to know this was two separate sentences and I think my single one is correct grammatically.
Duo doesn't count punctuation against you, so the problem must lie elsewhere. If it was a dictation exercise, those are supposed to be written in French.