now that I can posts links-this is a pretty good article about what I was writing about:
American English - Wikipedia, the free encyclopedia
other excellent British vs American links:
American and British English differences - Wikipedia, the free encyclopedia
British English - Wikipedia, the free encyclopedia
American and British English pronunciation differences - Wikipedia, the free encyclopedia
I just noticed that you are not a native English speaker-just wanted to note that from what you've written here I wouldn't know.
If I'd met many UK speakers that sounded like you-I might buy that American is an English dialect. It has it's own language rules, grammar and sentence structure, spelling etc. and there are now more non British English words in an American dictionary as British English words. That is a language.
May I just ask why is it important to learn one or another English dialect? (or whatever they call that) Why not choose a neutral approach? I can hardly believe that two men who speak different English dialects won't understand each other. May be they'll be confused with some details but this is not a surprise for me because this is about all languages.
That's crazy. I know the 100 most commonly spoken words are identical in both dialect and I'm willing to bet that the vast majority of the nex 200 are as well - spelling aside.
Simply becaue one calls something a truck and the other calls it a lorry makes them no more different than three parts of the US where one thing is called a spigot in one place and tap in another and a facucet in the third.
I can't understand why you would want to devote 250 pages to teaching the differences when they are 98% the same. (My estimate - but I surely don't believe it's less than 95%.)
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.