"I see a calendar on the wall."
Translation:Mi vidas kalendaron sur la muro.
I put "en la muro" and it was rejected because it wasn't "sur la muro."
Shouldn't "en" be allowed here? I mean, the reason I didn't use "sur" is because I'm not literally putting the calendar on top of the wall. So I thought "en" would work nicely.
But apparently DuoLingo doesn't agree with me (at least, not yet).
"en la muro" doesn't work for the same reason that "sur la muro" doesn't. Just like the calendar isn't on top of the wall, it isn't inside the wall.
I wonder why Duolingo doesn't accept "ĉe la muro", though.
In English, yes, but it's not actually ON the wall (on top of it) -- that's where the roof is. It's actually IN FRONT OF the wall.
"On" really only works for horizontal surfaces (on the floor, on the table).
Using it for walls is idiomatic and might not be the same in other languages. (It wouldn't work in German, for example -- things are not "auf der Wand" (on the wall) but rather "an der Wand" (at the wall).)