Prepositions express relationships in time and space. Some common prepositions include a, con, de, en, para, and por. Here are some prepositions that express time relationships:
antes de – before
después de – after
durante – during
hasta – until
The infinitive is the only verb form that can follow a preposition in Spanish.
¿Adónde vas después de estudiar? Where are you going after studying (after you study)?
Subject: ¿Qué Tal?