I was given this sentence
Сегодня мы с Джулией собираемся в поездку в Россию по программе обмена студентами.
по программе — dative, обмена — genitive, студентами — instrumental
why are these all in different cases? i understand that after it is required to be in the dative case but i dont know why exchange changed to genitive and students changed to instrumental.
the way i thought it worked was that everything referring to the initial thing you are talking about will be changed in the same case, so program is in dative , so i thought everything would be dative.
Is there a general rule i can follow to understand when to change a word into a specific case? i am really confused on how that works, especially in this sentence
i would love as much information and as many tips as you can offer to help me with this
thank you in advance