Unit 1 A The present (1): present simple; present continuous B The present (2): questions and negatives C Mixed practice: present simple; present continuous Unit 2 A The past (1): past simple; past continuous B The past (2): past perfect C Mixed practice: past simple; past continuous; past perfect Unit 3 A Quantifiers (1): quantifiers with countable nouns B Quantifiers (2): quantifiers with uncountable nouns C Mixed practice: quantifiers with countable and uncountable nouns Unit 4 A Comparatives and superlatives (1): regular forms of comparatives and superlatives B Comparatives and superlatives (2): irregular forms, and other ways of comparing C Mixed practice: comparative and superlative adverbs and adjectives Unit 5 A Present perfect and past simple: form and use; past simple B Present perfect continuous: form and use C Mixed practice: present perfect simple and continuous Unit 6 A The passive: form and general use B Particular uses of the passive: passives used in technical and scientific writing; passive + by + agent; sentences with a direct and an indirect object C Mixed practice: uses of the passive Unit 7 A The future: present simple and present continuous as future B The future: be going to + infinitive; will + infinitive C Mixed practice: present simple and continuous; will and be going to Unit 8 A Present modals (1): recommendation and obligation B Present modals (2): possibility, ability, permission C Mixed practice: present modals Unit 9 A Noun phrases: nouns with adjectives; nouns and prepositional phrases B Describing nouns: nouns followed by present and past participles C Mixed practice: nouns with adjectives, prepositional phrases, present participles, past participles Unit 10 A Relative clauses (1): defining relative clauses B Relative clauses (2): non-defining relative clauses C Mixed practice: defining and non-defining relative clauses Unit 11 A The past of modals (1): possibility, ability and certainty B The past of modals (2): obligation and advisability C Mixed practice: the past of modals Unit 12 A Conditional sentences (1): first and zero conditionals B Conditional sentences (2): second and third conditionals C Mixed practice: zero, first, second and third conditionals Unit 13 A Verb patterns (1): verb + ing form and verb + to + infinitive B Verb patterns (2): verb + ing form or + to + infinitive; verb + that clause C Mixed practice: verb patterns Unit 14 A Direct and indirect speech: direct speech; indirect speech in the present and past B Other indirect speech forms: asking, wondering and telling in indirect speech C Mixed practice: direct and indirect speech Answer key Index