What is proper and plain English?

The language which MUST be used in any instance where English language is used, it combines proper English and Plain English, so:
1. No sticky caps
2. No slangs
3. No jargons
4. Proper spellings (such as capitalization)
4. Comprehensible language, even underages and elderly people can understand it
5. No political correctness
6. Have a proper grammars (such as proper use of verbs, adjectives, and such)
7. Effective languages

Use proper and plain English everywhere

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proper and plain English - video