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certain (EN)
adjetivo, determinante, pronombre

adjetivo “certain”

forma base certain (more/most)
  1. cierto (completamente seguro o confiado sobre algo; sin ninguna duda)
    She was certain that she had locked the door before she left.
  2. cierto (definido o conocido con certeza; establecido más allá de toda duda)
    The evidence makes it certain that he committed the crime.
  3. Cierto (moderado; no lleno)
    We know to a certain extent how this new technology works.
  4. seguro
    If you go there, you'll face certain death.

determinante “certain”

certain
  1. cierto (específico pero no nombrado o descrito exactamente)
    She has a certain charm that is hard to define.
  2. cierto (indicando a una persona en particular que solo conoces por nombre)
    A certain Mr. Smith asked me if he could make an appointment.

pronombre “certain”

certain
  1. ciertos (algunos)
    Certain of the students were selected for the exchange program.