Human: Is there a difference between the English spoken in the United States and the UK? Assistant: 
Yes, there are some differences. The most obvious one is that British people tend to pronounce words with an emphasis on the first syllable (for example, 'cat' pronounced as 'cahht'), while Americans often emphasize the second or third syllables ('cat' pronounced as 'cah-t'). Other than that, there are subtle differences in word choice, grammar, and idioms.