Received Pronunciation (RP) is considered the standard British English accent. It is an accent, not a dialect, as RP speakers use Standard English. There are 20 vowels in English that can be divided into 12 monophthongs and 8 diphthongs. Vowels are classified based on tongue position and lip rounding. Word stress helps distinguish grammatical functions and morphological structures in English. Suprasegmental features like stress, tone, and rhythm are important for meaningful speech. Intonation involves pitch changes and conveys meanings through tones like falling, rising, and fall-rise.