The Art of Speaking and Writing Correctly

How to construct verbal and written speech skillfully, based on this or that situation, how to express oneself in a beautiful, yet not overly high-flown style, simple yet not overly simplistic? How can we express our thoughts more appropriately, what syntactic and and language expressions should we use to make the speech more emphatic, impressive, logical and influential?
Hayk Hambardzumyan spoke about the specifics of the art of speech with linguist Davit Gyurjinyan. 

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