Breakdown of Моя сестра едет на встречу.
сестра
sister
мой
my / mine
на
on, at / by (transport) / to (a place) / to (in answer to)
ехать
to go (by vehicle)
Questions & Answers about Моя сестра едет на встречу.
Why does the word for meeting end in -у (встречу)?
This is the Accusative case, which we use to show the destination of a movement. The dictionary form is встреча (meeting). Because it is a feminine noun ending in -а, it changes to -у when it is the destination you are going to.
Why do we use the preposition на instead of в for going 'to' a meeting?
In Russian, events and activities take the preposition на instead of в. Because a meeting (встреча) is an event rather than a physical building or enclosed space, you must use на.
How would I ask 'Where is my sister driving to?' based on this sentence?
You would use the question word куда (where to) because you are asking about a destination. The question would be: Куда едет моя сестра? Remember not to use где, which only asks where something is located right now, not where it is going.
Why is the verb едет used here instead of идёт?
Russian has different verbs for going on foot versus going by transport. Едет comes from ехать, which means to go by vehicle (driving, taking a train, etc.) in one direction. If she were walking to the meeting, you would use идёт.