Here are some examples:
* ¿Tienes alguna pregunta? (Do you have any questions?)
* Hay algunas manzanas en la mesa. (There are some apples on the table.)
* No he visto ninguna película esta semana. (I haven't seen any movies this week.)
It's important to note that "alguna" is used for feminine singular nouns, while "alguno" is used for masculine singular nouns. For plural nouns, you would use "algunos" (masculine) or "algunas" (feminine).