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why (EN)
adverbio, sustantivo, interjección

adverbio “why”

why (more/most)
  1. por qué
    Why did you decide to become a teacher?
  2. por qué no
    Why don't you take a break?
  3. para qué
    Why worry about the rain when we can have fun indoors?
  4. por el cual (cuando se refiere a la razón de una afirmación)
    He asked why she was crying.

sustantivo “why”

sing. why, pl. whys o no contable
  1. el motivo
    She always asked the whys behind her parents' rules, wanting to understand their reasoning.

interjección “why”

why
  1. una forma anticuada de expresar sorpresa, molestia o impaciencia
    Why, I had no idea you were coming today!