This document discusses the key parts of speech and elements of sentences in English language. It defines the eight main parts of speech as noun, pronoun, verb, adjective, adverb, preposition, conjunction, and interjection. It also explains the main elements of a sentence, including the subject, predicate, object, complement, phrases and clauses. Specifically, it provides examples to illustrate the subject, direct and indirect objects, subject and object complements, noun and verb phrases, and main and subordinate clauses.