My Turkish/Dutch dictionary tells me that nereye means 'waarheen' which implies a direction, so in English that would be 'to where'. Nerede means one place. From what I understand, I hope a native speaker will be able to tell if that is correct.
1 and 3 are both correct as "you" means you(singular)-Sen and you(plural)-Siz in Turkish. So, "where are you going?" means either "nereye gidiyorsun?" or "nereye gidiyorsunuz?" according to the context.
Hey guys, can you please clarify. Is there a difference between 'you' plural (gidiyorsunuz) and 'you' formal in Turkish? How would we say where are you going (in a formal sense ie. To your boss for instance)?