some people may not clearly know the differences between american english and british english though written english is similar in britain and america oral english is quite different generally speaking american english is different from british english in pronunciation and spelling for example when a learner is used to the british pronunciation he may not understand the american pronunciation immediately as for the spelling differences you can easily find then when you yse a conputer the spelling check on your computer shows american spelling such as color .center,dialog and traveled, these words are spelled as colour .centre .dialogue.and travelled in british english there are also differences in some expressions .for example .you relax in a sitting room in britain but in a living room in america .you fill in a form in britain .but fill out a form in the U.S.A.americans take the subway.while british peopke take the underground .however.most of the time .people from the two countries do not have much difficulty understanding each other