Hi!
I teach American English and the participle of the verb to get is "gotten", also all of its derivatives:
get, got, gotten
forget, forgot, forgotten
There are other differences between American and British English:
theatre (B) - theater (A)
colour (B) - color (A)
And words used differently:
fag (B) means cigarrette; (A) a derrogative word for gay
rubber (B) means "eraser"; (A) condom (a student of mine has gotten into trouble in the US because of the use of the word in class)
And things that have different names:
lorry (B) = truck (A)
flat (B) = apartment (A)
taxi (B) = cab (A)
The use of the words depends on the speakers � culture, and I find it very interesting to learn about those differences.
I learned British English and then enrolled in an American course. I got stuck the first time my teacher asked me "What time is it?" and when he explained I finally got it. "Ah, do you mean "have you got the time?""
Have a nice day!