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"Asistir" is an intransitive verb which is often translated as "to attend", and "costar" is a transitive verb which is often translated as "to cost". Learn more about the difference between "asistir" and "costar" below.
asistir(
ah
-
sees
-
teer
)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.
costar(
kohs
-
tahr
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
a. to be hard
Me costó decirle la verdad, pero sabía que tenía que hacerlo.It was hard to tell him the truth, but I knew that I had to do it.