"We hope to see a lot."
Translation:Wij hopen veel te zien.
Duo accepts the answer either with or without "om" after "hopen". Is there any rule that explains why that is so?
"Wij hopen te veel zien" would not be correct. In this scenario, "te" is acting as a preposition (voorzetsel), and must come after "veel".
[Note: "te" can be used as an adverb (bijwoord) when it is used to mean "too"]