Alguno/-a/-os/-as de for "one/some of" (partitives)

When you want to use “one/any/some of” to express a part of something, you’ll need to use partitives in Spanish: alguno/-a/-os/-as de

Learn how to say one of/some of in Spanish

The indefinite adjectives alguno/alguna/algunos/algunas can be used as partitives (i.e. expressing a part of something) when used with de to say "one of/some of...":

 For example:

Note that if we use it in singular we refer to "one" and if used in plural we refer to "some":

The second example above is using "alguna" in singular to refer to one within that group; we could have also used "una de nuestras compañeras" instead. However using "alguna" means that you are less specific whereas using "una" normally implies that you are referring to one in particular. 

Note that this partitive structure is often followed by a possessive:

It could also be followed by a subject pronoun:

Bear in mind that you always need a subject pronoun, not an object pronoun. This would be incorrect:

Here are some other articles and determiners that can also follow de:

 See also:

• Using algún (a, as, os) to say some or any in Spanish 
• Using alguno, alguna, algunos and algunas to say some, one or any in Spanish (pronouns)