Unidad 1: Aspecto y contraste temporal
Present Perfect / Present Perfect Continuous; contraste con Past Simple; Past Continuous; used to; futuros; time clauses
- Present Perfect (ever/never/just/already/yet)
- Present Perfect vs Past Simple (contraste)
- Present Perfect Continuous (duración)
- Past Continuous (acciones en progreso en pasado)
- Used to vs Past Simple (hábitos vs eventos)
- Future forms: will/going to/present continuous (planes vs predicciones)
- Time clauses (when, as soon as, before/after)