Part Ⅰ Sentence Structure
Unit 01 Intransitive Verbs vs. Transitive Verbs
Unit 02 Nominative Complement VS Objective Complement
Unit 03 Direct Object VS Indirect Object
Unit 04 Phrase VS Clause

Part Ⅱ Tense / Voice
Unit 05 Present Tense / Past Tense VS Progressive Tense
Unit 06 Future Tense vs. Future Substitute Expressions
Unit 07 Present Perfect vs. Past Perfect
Unit 08 Active vs. Passive Voice
Part Ⅲ Verbs (1)
Unit 09 Infinitive vs. Gerund
Unit 10 Nominal Function vs. Verbal Function of Gerunds
Unit 11: Adjectival vs. Adverbial Use of the Infinitive
Unit 12 Semantic Subject of Infinitive VS Semantic Subject of Gerund
Unit 13 Simple Verbs vs. Perfect Verbs
Unit 14 Active vs. Passive Verbs

Part IV: Verbs (2)
Unit 15 Present Participle vs. Past Participle
Unit 16 Active Participle Phrases vs. Passive Participle Phrases
Unit 17 with Participle Phrases vs. Independent Participle Phrases

Part V Conjunctions / Relatives (1)
Unit 18 Conjunctions in Noun Clauses vs. Conjunctions in Adverb Clauses
Unit 19 Nominative Relative Pronouns VS Objective Relative Pronouns
Unit 20 Relative Pronouns what VS Relative Pronouns and Conjunctions that

Part Ⅵ Conjunctions / Relatives (2)
Unit 21 Relative Pronoun that VS Conjunction that
Unit 22 Relative Pronouns vs. Relative Adverbs
Unit 23 Restrictive Use of Relatives VS Continuous Use of Relatives
Unit 24 Relative Verbs vs. Interrogative Verbs

Part VII Nouns / Pronouns
Unit 25 Countable Nouns vs. Uncountable Nouns
Unit 26 this VS that
Unit 27 Interpreted it VS Uninterpreted it
Unit 28 all / each / every VS both / either / neither
Unit 29 another VS other(s)

Part Ⅷ Adjectives / Adverbs
Unit 30: Definite vs. Descriptive Use of Adjectives
Unit 31 Adjectives vs. Adverbs
Unit 32 few VS little
Unit 33: Comparative vs. Superlative
Part IX Auxiliary Verbs / Subjunctive Mood
Unit 34 Auxiliary Verbs VS Auxiliary Verbs＋have pp

Unit 35 Indicative vs. Subjunctive Mood

Part Ⅹ Prepositions / Agreement / Special Constructions
Unit 36 ​​Prepositions vs. Conjunctions
Unit 37 Singular Verbs vs. Plural Verbs
Unit 38 Tense Agreement VS Exceptions to Tense Agreement
Unit 39 Parallel Structures by and, but, or VS Parallel Structures by Correlative Conjunctions
Unit 40: Plain vs. Inverted Sentences

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