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Both "asistieron" and "asistían" are forms of "asistir", which is often translated as "to attend". Learn more about "asistir" below.
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
2. (to observe)
a. to witness
Estamos asistiendo al comienzo de una nueva era.We are witnessing the beginning of a new era.
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
3. (to help)
a. to attend to
La enfermera me asistió porque era una urgencia.The nurse attended to me because it was an emergency.
