1. Preterite vs Imperfect Usage

2. Present Time Habitual Action I always go to the library on Mondays. Siempre voy a la biblioteca los lunes. Present Tense

3. Present Time Action-in-Progress At this moment I am talking on the phone. Ahora hablo por teléfono. Estoy hablando por teléfono. Present Progressive Present Tense

4. Present Time Immediate Future I will go to the library on Monday. Voy a la biblioteca el lunes. Iré a la biblioteca el lunes. Present Tense Future Tense

5. Present Time Future (going to do something) I am going to see my friends in the library on Monday. Voy a ver a mis amigos en la biblioteca el lunes. Ir + A + Infinitive

6. Past Time Habitual Action I always used to go to the library on Mondays. Siempre iba a la biblioteca los lunes. Imperfect Tense

7. Past Time Action-in-Progress At that moment I was talking on the phone. En ese momento hablaba por teléfono. Estaba hablando por teléfono. Past ProgressiveImperfect Tense

8. PastTime Immediate Future (That day) I would go to the library at a later time. Ese dia Iría a la biblioteca el lunes. xxx Conditional Tense

9. Past Time Earlier that day, I was going to see my friends in the library at 2:00 p.m. Más temprano, iba a ver a mis amigos en la biblioteca a las dos de la tarde.... (was going to do something) Ir + A + Infinitive

10. Past Time A sequence of events... First, I went to the library, then I walked home, and later, talked on the telephone. Primero fui a la biblioteca, luego caminé a mi casa, y más tarde hablé por telefono. Preterite Tense