This volume introduces the use of prepositions in Spanish, the contexts in which they appear and the differences between them. Students will discover how prepositions work through real examples. The grammar books of Colección Paso a paso are appropriate for both the self-directed student who wants to focus on grammar outside of the classroom, and the teacher who is looking for new techniques in grammar instruction. Topics are presented intuitively and in manageable segments, and language skills are arranged by level of difficulty.