Three areas of the English language with rapid changes are:
1. Vocabulary: The creation of new words (neologisms) due to technology and social media (e.g., 'selfie', 'google').
2. Grammar: A simplification of rules in informal communication, such as the changing use of prepositions and pronouns.
3. Lexis and Slang: The rapid adoption of internet slang and informalities into mainstream language, changing the meanings and usage of words.