TABLE OF CONTENTS PAGEUNIT 1: TENSES 2UNIT 2: PASSIVE VOICE 11UNIT 3: TAG QUESTIONS 19UNIT 4: ADVERBIAL CLAUSES AND CONNECTORS 21UNIT 5: SUBJECT-VERB AGREEMENT 31UNIT 6: SPEAKING 34UNIT 7: CONDITIONAL SENTENCES AND WISHES 39UNIT 9: RELATIVE CLAUSES 57UNIT 10: ARTICLES 66UNIT 11: REPORTED SPEECH 69UNIT 12: PREPOSITIONS 78UNIT 13: COMPARISONS 85UNIT 14: PHONETICS 94UNIT 15: COMMON STRUCTURES 101ANSWER KEY 111UNIT 1: TENSES 111UNIT 2: PASSIVE VOICE 112UNIT 3: TAG QUESTIONS 113UNIT 4: ADVERBIAL CLAUSES AND CONNECTORS 114UNIT 5: SUBJECT-VERB AGREEMENT 114UNIT 6: SPEAKING 115UNIT 7: CONDITIONAL SENTENCES AND WISHES 115UNIT 8: GERUNDS AND INFINITIVES 117UNIT 9: RELATIVE CLAUSES 118UNIT 10: ARTICLES 119UNIT 11: REPORTED SPEECH 119UNIT 12: PREPOSITIONS 121UNIT 13: COMPARISONS 122UNIT 14: PHONETICS 123UNIT 15: COMMON STRUCTURES 124TÀI LIỆU THAM KHẢO 127UNIT 1: TENSESA. Use the correct form of verbs in brackets.In all the world, there (be) __________ only 14 mountains that (reach) __________above 8,000 meters.He sometimes (come) __________ to see his parents.When I (come) __________, she (leave) __________for...