DIFFERENCES BETWEEN BRITISH AND AMERICAN ENGLISH Here's a good site that has listings for both dialects: http://www.uta.fi/FAST/US1/REF/usgbdiff.html#b2a

Well..American English is a by-product of British English(Just my own personal views...no offense)when British arrived there and built some colonies.So mostly,Americans and British can understand each others...But after hundred years of development,they do differ a little bit nowadays.At pronunciation part,they are alike to some extent...but Americans have changed some ways writing English words,like"centre"..in American English,it is "center"...and in American English,the word"theatre"is written as"theater"..as for their grammars...those don't differ a lot..quite similar,but some particular ways of expressing things are a little different,like in British way,people usually say"I haven't had my lunch."But Americans are usually all,"I didn't have my lunch yet"..so the verb tenses are a little different...and when British and Americans are on the phone..the first sentences they say differs,too...Americans are always like,"Hey,this is Jesse...is this..??"But British people always say"Hi,This is Jesse,is that*...??"...and their oral pronunciation are quite different...especially that in American English "r"always appears in many words...but this"R" is different from that in Spanish..

There are some differences in the use of prepositions (e.g., the Brits say, "At the weekend" and the Yanks say, "On the weekend"). There are some spelling differences (e.g., the UK "colour" vs. the USA "color"). Some words, e.g., "aluminum," are pronounced completely differently on both sides of the Atlantic. Mostly, however, the differences are with slang, not grammar or pronunciation.

It's alright, solamente necesitas practicar y mejoraras :D :D :D I wish you the best of luck with your studies :)

thanks a lot !! :D my english is basic :S .!! so.... !!