He desayunado esta mañana.
English: I have had breakfast this morning.
The 'pretérito perfecto' is a Spanish past tense used to talk about actions that have happened recently or have a connection to the present.
Use the 'pretérito perfecto' to talk about actions completed in a time period that includes the present (like today, this week) or when the result is important now.
He desayunado esta mañana.
English: I have had breakfast this morning.
¿Has visto mi libro?
English: Have you seen my book?
Hemos terminado la tarea.
English: We have finished the homework.
Mis amigos han llegado.
English: My friends have arrived.