The Progressive tenses always suggest that an action was or is in progress, but it can never refer to the future. This tense is formed by using the present, preterit, imperfect, future, conditional or subjunctive forms of the verb estar with the –ndo ending, or the gerund. The gerund, or the present participle can be thought of as the English –ing (i.e. walking). Verbs that end in –ar use –ando, and verbs that end in –er and –ir use –iendo.

llorar (cry) => llorando
escoger (choose) => escogiendo
repetir (repeat)= repitiendo

- Estoy viajando sola. (I am travelling alone.)
- Estuvieron caminando hasta que los recogieron. (They were walking until they were picked up.)