Привет iris! "here you go" -> stated when giving or handing over an object to someone -> for example: (Physical object) Me: Did you prepare my documents for the meeting? You: Yes, here you go. (give / hand over) (Digital object) Me: Please e-mail me a copy of those files. You: Definitely, here you go. (attach & send) "here we go" -> stated when the speaker is about to do something daunting, challenging, lame or stupid. -> for example: (When skydiving) You: Oh dear! Here we go... (then jumps!) "here we go again" -> stated when something starts happening again. -> for example: (When your boyfriend persistently asks if you are cheating on him) You: (Sigh!) Here we go again. Hope that helps. (^_^)

Hi Iris, I agree with Bill, and would just like to add one other common use for 'here we go' which is to indicate that something bad is happening again: 'Oh, here we go (again), shouting (or moaning) at me as usual'. You might also join in singing 'Here we go, here we go, here we go' if you were watching a British football match and your team was winning. Also, there is the other quite similar expression 'there you go' which can mean 'well done, or that's correct'.

Here you go: when giving someone something they have asked for, or something that will allow them to start some process (a tool they need, or some clothing they need to wear). Here we go: to announce to the rest of a group that you are part of that the group is about to start a journey or process. For instance, you're sitting in a roller-coaster and it starts to move. Or, you're in a car, driving somewhere, and looking for a particular turnoff, and suddenly you see it.