About this About the TOEFL Diagnostic test Unit nouns Unit Verbs Unit Infinitives and Gerunds Quiz Units – Unit Clauses and sentences Unit Conjunctions Unit Adverb Clauses Quiz Units – Unit Adjective Clauses Unit noun Clauses Unit Conditional sentences Quiz Units – Unit singular and Plural Unit Articles Unit subject–Verb Agreement Unit Pronoun Agreement Quiz Units – Unit Comparison Unit Prepositions Unit Word order Unit Parallel structure Quiz Units – Unit Word Form Unit Common Word errors Unit Punctuation Quiz Units – Review test Answer Key Audio scripts Index How to score speaking How to score Writing score Charts