Amount of timeEn is used to express an amount of time necessary for completing something. This usage of en is similar to a familiar English preposition “in.” •Terminó la tarea en diez minutos.She finished the task in ten minutes.•Volvimos en unos minutos.We returned in a few minutes.Price exchange and how something is doneThe preposition en is used in many places that could just as easily use the preposition por. For example, to indicate the price of exchange or the means by which something is done. Either preposition is acceptable in such cases. Also, en can be used instead of por to indicate the price of exchange. For example: •Te lo dejo en diez pesos.I'll let you have it for ten pesos.In some specific expressions, en is used to indicate the means by which something is done (for more expressions, see Appendix ).
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