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a su amigo

to his/her friend

→ a
phrase Common #9,542
to his/her friend Depending on the sentence, a can also mark his/her friend as a direct object rather than mean “to.” Su can mean his, her, or their.
SP: Le escribió una carta a su amigo.
EN: He wrote a letter to his friend.

Él defendió a su amigo de todas las críticas.

He defended his friend from all the criticism.

Deje aquí a su amigo.

Leave your friend here.

Yo estaba mirando a su amigo.

I was looking at his friend.

— La vida de Adèle (2013)

Hallamos a su amigo aquí, en una isla.

We found your friend here, on an island.

Que lo encontraron a su amigo.

They found his friend.

— El secreto de sus ojos (2009)

Bob se quejó a su amigo.

Bob complained to his friend.

El hombre despierta a su amigo.

The man wakes up his friend.

Él le enseña inglés a su amigo.

He teaches English to his friend.

Díganle a su amigo que pare.

Tell your friend to stop.

— El odio (1995)

Él perdió de vista a su amigo entre la multitud.

He lost sight of his friend in the crowd.

Mary siguió a su amigo hasta el hotel ya que ella no conocía bien el área.

Mary followed her friend to the hotel since she didn't know the area well.

Él salvó a su amigo arriesgando su propia vida.

He saved his friend by risking his own life.

Ya tiene de vuelta a su amigo.

You already have your friend back.

Él no pudo abandonar a su amigo en dificultades.

He could not abandon his friend in trouble.

Acudió a su amigo para ayuda.

He went to his friend for help.

Tom miró a su amigo.

Tom looked at his friend.

Él le regaló su cámara a su amigo.

He gave his camera to his friend.

Él encontró a su amigo mientras nadaba en el mar.

He found his friend while swimming in the sea.