¿Cuál es correcto? No ví nada mientras estaba corriendo. o No ví nada mientras corrí. ¿Ambos son incorrectos? Lo siento por el título.
For example, if I wanted to say "They used to travel every day", which would I use: Ellos viajaron cada día. Ellos viajaban cada día.
In school, I learned that the Spanish past tenses were called preterite and imperfect in English, and preterito and imperfecto in Spanish. However, in talking to native speakers I've run across other ...