1) The document discusses the differences between official/standard English and authentic English. Official English is what is needed to pass tests, get good jobs and visas, while authentic English is what local English speakers use in everyday communication.
2) Authentic English has no fixed rules and is always changing based on the needs of its speakers. It can be assessed solely based on whether communication is achieved.
3) English originated and has continued evolving as a way for people from different language backgrounds to communicate, by borrowing elements from other languages and developing creatively without strict structures.