Finally — an upper-intermediate Spanish grammar book that treats you like an adult. If you can hold a conversation in Spanish but still hesitate before complex sentences, still avoid the subjunctive, still freeze when writing a formal email — Spanish Grammar Unlocked: Level 3 was written specifically for you. This is not a phrasebook. It is not a beginner review. It is a structured, no-filler grammar course for learners at B1 level who are ready to push into genuine B2 fluency — the level recognised by universities, employers, and official language certifications worldwide. What you will master in this book The subjunctive in all its forms — present, past, and how to choose correctly every time Sequence of tenses — how tense choices chain together across clauses Si clauses (all types) — real, hypothetical, and impossible conditions done right Indirect speech — reported statements, questions, and commands with correct tense shifts Formal written Spanish — academic register, nominalisation, and essay structure The full passive system — ser, estar, se pasiva, and when native speakers avoid the passive entirely Advanced discourse markers — sin embargo, no obstante, en cambio, a pesar de ello, and how to use them naturally Cuyo and advanced relative clauses — the structures most grammar books skip Advanced prepositions — por, para, and the tricky ones that cause errors at every level Register mastery — switching between colloquial, neutral, and formal Spanish with confidence How the book is structured 21 chapters , each built across four pages: a clear grammar explanation, worked examples with analysis, targeted drills, and a writing or production exercise. Every chapter is designed to fill exactly one learning session — no guessing where to stop. 5 Mistake Clinics — dedicated sections that identify the most common B2-level errors, explain exactly why they happen, and show the correction with real-language examples. 3 Annotated Mini Stories — authentic dialogues that demonstrate the grammar in natural use, with vocabulary notes and comprehension questions. 2 Spaced Review Checkpoints — cumulative exercises placed strategically through the book to consolidate everything covered before moving forward. A complete Writing Workshop and Conversation Lab — chapters dedicated to producing real B2 output: opinion essays, formal letters, debate contributions, and spontaneous speech. Back matter included B2 Master Tense Map — a full conjugation reference covering all key tenses 300 Essential B2 Phrases — organised by register and function Complete Answer Key — for every drill and exercise in the book Who this book is for This book is for self-studying adults and independent learners who have completed an A2 or B1 level course — or worked through Volume 1 or Volume 2 of this series — and are ready for the structures that separate intermediate learners from genuinely advanced speakers. It works as a standalone course. It also completes the three-volume Spanish Grammar Unlocked programme alongside Level 1 (A1 to A2) and Level 2 (A2 to B1). If you are serious about reaching B2 in Spanish, this is the book that will get you there.