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a su fiesta

to his/her party

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phrase Uncommon #17,313
to his/her party Used with a possessive pronoun: "su" can mean his, her, or their depending on context.
SP: No puedo ir a su fiesta esta noche.
EN: I can't go to his party tonight.

Pero no podré ir a su fiesta.

But I won’t be able to go to your party.

— Nicky, la aprendiz de bruja (1989)

Tom invitó a Mary a su fiesta.

Tom invited Mary to his party.

Tom quería que Mary viniera a su fiesta.

Tom wanted Mary to come to his party.

Juega bien tus cartas y Tom te podría invitar a su fiesta.

Play your cards right and Tom might invite you to his party.

Fui a su fiesta.

I went to her party.

Dile a Tom que no planeamos en ir a su fiesta.

Tell Tom we don't plan to go to his party.

Incluso me invitó a su fiesta.

He even invited me to his party.

— A primera vista (2014)

Max le explicó a Julia por qué no podía ir a su fiesta de despedida.

Max explained to Julia why he couldn't go to her farewell party.

Tom pensaba que Mary vendría a su fiesta.

Tom thought Mary would come to his party.

Quiero ir a su fiesta.

I want to go to her party.

Ella le invitó a su fiesta.

She invited him to her party.

Estabas enfadada con él, no sé por qué vas a su fiesta.

You were angry with him, I don't know why you're going to his party.

— Nicky, la aprendiz de bruja (1989)

Tom le preguntó a Mary cuántas personas habían ido a su fiesta.

Tom asked Mary how many people had come to her party.

Tom me invitó a su fiesta.

Tom invited me to his party.

Ella le explicó por qué llegó tarde a su fiesta.

She explained to him why she was late to his party.