I was wondering if I might/could go

[EngLearner]

Suppose you and your friend are playing volleyball. The ball goes over the fence into your neighbor's yard. You want to retrieve the ball, and you say to your neighbor:

1. Sorry, I knocked my ball over your fence. May I go and retrieve it please?
2. Sorry, I knocked my ball over your fence. Can I go and retrieve it please?
3. Sorry, I knocked my ball over your fence. I was wondering if I might go and retrieve it.
4. Sorry, I knocked my ball over your fence. I was wondering if I could go and retrieve it.

Version #1 was suggested in this thread by a native English speaker. Are the other three versions possible in this scenario? I'm wondering about the bolded verbs.

 

[emsr2d2]

They're all possible.

 

[emsr2d2]

One extra note - if you're speaking to the person whose garden your ball is now in, I'd use "come", not "go", in all four sentences. Using "go" suggests "leave". If you're a child, you might say to your parents "I've knocked the ball into the next door neighbour's garden. Can I go and retrieve it?"

Using "come" changes the emphasis to the viewpoint of the neighbour.

Can I come into your garden and get my ball?