This is the answer booklet for the French Sentence Builders: Trilogy-Part I -GRAMMAR BOOK has been conceived as a supplement to our French Sentence Builders: Trilogy - Part I book It is divided into 15 units, with matching Sentence Builders from the main Trilogy book. Each of the units is based around one Main Grammar Focus, which is explained and then taught via an array of engaging Conti, EPI, vocab building, translation and writing tasks. There are also additional Pop-up Grammar sections to introduce and teach other grammatical points required throughout the book. This grammar book has been carefully crafted based on the following research-informed grammar principles: a grammar teaching sequence should not move to production until the knowledge of the target grammar is established receptively; the transition from the receptive to productive processing of the target grammar should be gradual and seamless; the target grammar should be practised with vocabulary that the learners are highly familiar with in order to minimize cognitive load; language learners should only be taught grammar structures which are highly frequent, have high surrender value and that they are developmentally ready to learn in order to prevent forgetting, the target grammar must be recycled several times over the weeks and months after it was first taught interleaving practice with two or more structures is beneficial for retention grammar teaching should be as multimodal as possible the synergy of explicit and implicit instruction is more effective than either type of instruction on its own automatic/fluent retrieval is a must when it comes to the most important grammatical features