(BQ) Ebook Grammar rules: Part 1 presents the following units: Unit 1: nouns, avoid slang sentence subjects, proofreading; unit 2: verbs, singular and plural nouns, more sentence subjects, proofreading; unit 3: common and proper nouns, verb to be, simple sentence diagrams, subject-verb agreement; unit 4: more verbs, contractions, more simple sentence diagrams, proofreading; unit 5: nouns and verbs, more singular and plural nouns, compound subjects, compound subject-verb agreement; unit 6: more n