<em>Mi primo y yo conocemos a los jugadores del Real Madrid. Ellos </em><em>son</em><em> españoles</em>
son is the conjugation of the verb ser (to be) for the third-person plural in the simple present. The verb <em>ser </em>is used to talk about permanent or lasting attributes. In this way, this verb stands for <em>descriptions, occupations, characteristics, time, origin </em>and <em>relationships. </em>In this sentence, the verb <em>ser </em>stands for <em>descriptions. </em>This talk about the essential qualities that describe a person or things like <em>names, nationalities, physical descriptions</em> and <em>religions.</em>