Buena oportunidad?

Question

"Buen and mal can be used in front of masculine singular nouns, but they keep their longer forms "buena" and "mala" when used with feminine singular nouns."
I chose buena with the feminine singular noun oportunidad, but apparently it was wrong.

Silvia Píriz · Accepted Answer

Hola Peter M.
Thank you for your question!
I've checked your test results, and I can see where the confusion comes from.
You're absolutely right that buena is used before feminine singular nouns, as in una buena oportunidad (a good opportunity).
However, in this particular question, the English sentence says "I have been given a great opportunity at work", so the adjective we're looking for is grande (great), rather than bueno (good).
Unlike bueno, grande is shortened to gran before both masculine and feminine singular nouns.
For example:
Una gran oportunidad = A great opportunity
Un gran amigo = A great friend
So the correct answer here is:
Me han dado una gran oportunidad en el trabajo.
I hope this clears up the confusion!
Un saludo
Silvia