Here are the three basic "e" sounds:
"les" of "les murs" has a more "closed" e sound: think of the "e" sound in "mes amis" or the e on the end of "canapé." The "é" is always that closed sound. The two first vowels of "généralement" are also the same as the "les" vowel.
"le" of "le mur" is a much more neutral sound; most people call it a "schwar." The same sound as "de", "je", "ne pas", "devant". It is slightly shorter and more like an "uh."
The third sound is the open E, often distinguished by an "è". Think of "c'est", "frère, mère", "très" "j'aime" is actually the same sound too.
All those little words often come in two different versions: de/des, le/les, me/mes, ce/ces, se/ses; even the difference between the always closed é sound of "et" and the always open è sound of "est."
It's important to get to hear the distinction - it can be subtle, but I've found that on the whole duolingo does make the distinction clear enough.
"On" means "one" in the sense that we sometimes use "one" as a general subject in English: "one eats steak with a steak knife", "one opens a locked door with a key", whatever. It seems a little more flexible in French, though. There are cases in English where we use "we" in a general sense--in fact, I'm doing it quite a lot in this post. If I translated this post into French, a lot of the places where I'm saying "we" I'd be saying "on" instead. My understanding is that if you say "nous" for "we", then you're not using "we" in a general sense, but to specifically refer to yourself and those with you.
On peut écrire ça sur les murs !
Nous can write that on the walls.!------It was incorrect translation.
CORRECT SOLUTIONS: You can write that on the walls! One can write it on the walls!
On = in a grammar explication "On crie "vive l' América and nous crions "vive la France"-"it is express that who shouts Long live the America was a bigger group and in this group was a smaller group who shouts Long live the France. Translated in French:" On crie vive l'América et nous crions "vive la France.!" It try to explain the difference between"on" and"nous"
I want to refer to my previous comment when the DUO qualified "nous" answer as wrong. I wrote an example which can be found and if will have found it I put the link here. "On crie "vive l' América and nous crions "vive la France"-This sentence explains the"on" with "set theory" -i(n French: "Théorie des ensembles") a mathematical theory. There is bigger set(ensemble) this is the "ON" it includes everybody / we/you/they/ one/ people etc/ Till they are standing and they don't shout it is a homogeneous mass (on/people/nous/ vous/ils/ when in this set/mass (ensemble) there is a group who begins to shout : "Vive la France"- they are in the mass(on), but they form a little set/mass (ensemble) in the big mass and we can say thet "they,/we/you/someones/ etc can't began to shout: "Vive la France." That's why if sb translates on = by NOUS/ VOUS / ILS/ELLES / PEOPLE/ ONE(S )etc the translation is good.
So when the DUO didn't accept this translation -----wasn't right.
On peut écrire ça sur les murs ! Nous can write that on the walls.!------It was "nous" incorrect translation. CORRECT SOLUTIONS: You can write that on the walls! -You is a correct. Why is good "vous" and why isn't good "nous". NONSENSE. *One can write it on the walls!
It can. It's an impersonal pronoun, and, while in English we do use "one" in a similar way (One doesn't like to make a scene). it's a bit old-fashioned and pretty rare. In French it's much more commonly used. Because of this difference in tone, it is often not quite right to translate "on" directly as "one", and more colloquial terms, like "we" or even "you", convey the meaning better. I hope you don't find the above to be more doublespeak. Please ask if you require futher clarification.