At school, I teach that you need to match the social register with your manner of speech.
There is a way kids talk to their parents, their families and their friends. This is the Intimate register, and the least formal.
There is a different way you speak at school. It is scholastic, and a bit more formal (no cussing, more Standard English, what you call prescriptive.)
Then, moving up the register more, there is the language you use in the business world, getting a loan at a bank, and how you address the judge in court.
The most formal are niche registers of jargon specific to a business or trade, that you have to prove the ins and outs of your knowledge. Collegiate, Computers, Banking, etc.
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There is a way kids talk to their parents, their families and their friends. This is the Intimate register, and the least formal.
There is a different way you speak at school. It is scholastic, and a bit more formal (no cussing, more Standard English, what you call prescriptive.)
Then, moving up the register more, there is the language you use in the business world, getting a loan at a bank, and how you address the judge in court.
The most formal are niche registers of jargon specific to a business or trade, that you have to prove the ins and outs of your knowledge. Collegiate, Computers, Banking, etc.