<human>:  What are the differences between American and British English?
<bot>: The main differences between American and British English are primarily lexical, with some variations in grammar and spelling. American English tends to be more direct and succinct in its word choice, while British English tends to use more elaborate and longer words to express the same meaning. Grammatical differences also exist, such as the use of the present perfect in British English instead of the simple past in American English, and the use of phrasal verbs in British English, which are often expressed as single words in American English. Spelling also varies slightly between the two dialects, with British English more closely spelling words in the manner they were originally derived from Latin.