Syntax is the name given to the rules of structuring of the parts of speech to create clauses, phrases and sentences to create meaning.
Sentences: The basic complete unit of communication.
Using simple sentences: for clear meaning.
Using compound sentences: for rich detail and (maybe) confusion.
Using irregular sentences:
Using statements: to establish facts, express feelings and appreciate others.
Using questions: to acquire information and cause thinking.
Using commands: to gain compliance.
Using exclamations: to grab attention and evoke emotion.
Clauses: The basic structure used in sentences.
Clause arrangement: Subtle changes of arrangement and meaning.
Phrases: Even smaller parts of sentences.