Breakdown of Мы идём на балет.
мы
we
на
on, at / by (transport) / to (a place) / to (in answer to)
идти
to go (on foot) / to proceed, go (of a process)
балет
ballet
Questions & Answers about Мы идём на балет.
Why doesn't балет change its ending if it is the destination?
Because балет is a masculine, inanimate (non-living) noun. When indicating a destination, we use the Accusative case. In this case, masculine inanimate nouns do not change their endings at all. They look exactly like their dictionary form.
Why do we use на instead of в to mean 'to'?
In Russian, we use the preposition на for events, activities, and performances (like a ballet, concert, or match). We use в for going inside enclosed physical spaces (like a house or a bank). Since a ballet is an event, we say на балет.
If I want to ask 'Where are we going?' how do I say it?
You would use the destination question word Куда (Where to). The question would be Куда мы идём? Remember not to use Где (Where at), because Где is only used to ask about a location when someone is already staying there, not when they are moving toward a destination.
Does идём mean we are walking or driving to the ballet?
The verb идти (the dictionary form of идём) specifically means moving on foot. If you were taking a taxi, driving, or using the subway, you would use a different verb of motion.