Often you use da when the verb is in some sense "passive." In this case, "to remember" hasn't got an obvious subject. "For people to remember" is more or less what it means. This sort of "passive infinitive" usually comes into Italian with da.
in addition to it, i've seen a rule that in constructions with c'e' and ci sono it is always "da + infinitive" being used! it is hard to say by now if it always works or not, not enough examples i've come across yet, but i would be very happy if it really was a universal rule!
Accepted 3/1/2019! I had a different mistake initially, so duo called me out on both that and "beautiful," but I corrected the other mistake and kept beautiful on the next try to see if it worked, and it did, so perhaps something similar happened to you?
try to explain when, in english, you use "to", "in", "at", "for", "from", "per" etc. I think it's one of the most difficult thing because they have sense just for native-lenguage people.
I keep asking the same thing as often as I can! This is truly confusing me :) Hope we get some answers :)
It would be great if the audio for the listening exercises actually sounded like what it was supposedly saying. Da and di should sound different.