题目：
多选题
According to Hymes, communicative competence includes the following aspects:
- A. knowing whether or not something is in fact done: Do people actually use language this way?
- B. knowing whether something is in line with social norms
- C. knowing whether or not something is formally possible (grammatically acceptable), which is roughly equivalent to Chomskyˊs linguistic competence
- D. knowing whether something is understandable to human beings
答案：
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