Abstract:American English and British English are the two most important variants of the English language. They influence each other and are mutually complementary. Due to the historical, political, cultural and environmental factors, the two language variations have some differences in various aspects. Relatively speaking, British English is more conservative. Subject to the influence from foreign culture, however, American English is much more capable of absorbing and creating. Nowadays, American English and British English have some differences in pronunciation, spelling, vocabulary, grammar, and usage. Therefore, to understand the differences between American English and British English and to grasp their rules are very important. This thesis will analyzes these differences and regularity so as to help English learners avoid unnecessary misunderstanding and to enhance their practical ability of using English.
Key words: language variation; American English; British English; the differences