1. All languages are equally complex and capable of expressing ideas. There are no primitive languages - the vocabulary of any language can expand.
2. Descriptive linguistics focuses on objectively describing how a given language is actually used by its native speakers, rather than judging what is correct or incorrect.
3. Black English, also known as African American Vernacular English, is a systematic dialect with its own rules rather than just random errors. It is as complex and logical as Standard English.