Questions & Answers about Vi ser forestillingen i operaen i aften.
Why does i operaen come before i aften?
This sentence follows the standard Danish rule for sentence endings: Place comes before Time. Because i operaen describes the place and i aften describes the time, they must appear in that exact order.
Why does the Danish sentence use ser when the English translation says 'are seeing'?
Danish does not have a continuous '-ing' tense. You just use the simple present tense ser (see). Furthermore, Danish frequently uses the present tense to talk about future plans, as long as a time like i aften is included to make it clear.
Why use i for both i operaen and i aften?
Prepositions often do not translate directly. You use i for i operaen to show you are physically inside the building. For i aften (tonight), i is the fixed preposition used for parts of the current day, just like in i dag (today) and i morgen (tomorrow).
Can I use om aftenen instead of i aften here?
No, because they have different meanings. You use i aften to mean this specific evening (tonight). You use om aftenen to talk about a general habit, meaning 'in the evenings' in general.