7.A simple grammatical structure (sentence: noun phrase/verb phrase/noun phrase) can generate increasingly complex structures both at the level of the sentence and beyond to the paragraph, the chapter, the book even.
8.For language learners, the most important point for learning English is to understand the 8 kinds of syntactical functions: Noun, Pronoun, Verb, Adjective, Adverb, Conjunction, Preposition and Interjection.