It sometimes amazes me that anybody can learn our language who didn't grow up with it.

English Pronunciation is a pleasing bit of verse by G. Nolst Trenité. It begins:

Dearest creature in creation, Study English pronunciation. I will teach you in my verse Sounds like corpse, corps, horse, and worse...
And you can read the rest here. Lovely. Many thanks to Dave Hodgkinson for the link. There was a time (back when I was at school with Dave) when I could speak a reasonable amount of Esperanto. Don't remember much now, but I still can't help thinking it's a good idea.