Using buen,bueno, buena, bien, malo, primero, uno, alguno etc


Many students make errors in using ‘bien, buen, bueno, buena etc’ as adjectives or adverbs. When to use with suffix, when without is a cause for confusion and errors.

1)    Bien is an adverb, it is used without the substantive and is used without suffix ‘o’ or ‘a’. Eg: Lo has hecho bien

2)    Bueno, buena and buen are adjectives and are used directly before or after the substantive. If the masculine form is used directly before the substantive, you will not use bueno (with an ‘o’) but buen. However, when used AFTER the substantive, it will keep it’s ‘o’.

3)    Similar effects occur for other often used adjectives such as:  malo, primero, tercero, uno, alguno, and ninguno

Below are some examples:

  • ¿No conoces a ningún estudiante?                          Don´t you know any students?
    • Masculine and before the substantive, therefore without an ‘o’
  • Es una casa buena                                                     It’s a beautiful house
    • Feminine adjective and therefore with an ‘a’
  • Es un momento bueno                                                It is a good moment.
    • Masculine but after the substantive, therefore with an ‘o’
  • Es un buen trabajo                                                     it’s a good work/ fine job
    • Masculine and before the substantive, therefore without an ‘o’
  • No conozco a nadie todavía. Es mi primer día.          I don´t know anyone yet. It´s my first day here.
    • Masculine and before the substantive, therefore without an ‘o’
  • ¿Hay algún consejo que te puedo dar?                    Is there any advice that I can give you?
    • Masculine and before the substantive, therefore without an ‘o’
  • No, he tenido un mal día, nada más.                         No, I´ve had a bad day, that´s all.
    • Masculine and before the substantive, therefore without an ‘o’
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