<human>:  Tell me what the differences are between British English and American English
<bot>: The main difference between British English and American English is in the way they spell and pronounce words. For example, British English favors ‘ise’ and ‘our’ spellings, whereas American English favors ‘ize’ and ‘or’ spellings. Additionally, British English speakers tend to use more formal language than American English speakers. Other differences include standard British vocabulary versus American vocabulary, differences in grammar and relationship between verb tenses, and different idioms. There are also pronunciation differences; Brits more frequently switch their vowels out for different variants and they rarely ‘drop their Rs’.