sí
Meanings
Particle
1. yes, yeah, (used to respond affirmatively to a question, used both informally and formally)
2. Used to give positive emphasis to a verb, which is often replaced. Functions similarly to English do.
Examples606
"Les gusta el chocolate, ¿verdad?" "A mí sí, pero a él no."
"You both like chocolate, right?" "I do, but he doesn't."
No sabemos si es sostenible, pero lo que sí sabemos es que funciona muy bien.
We don't know if it's sustainable, but what we do know is that it works very well.
Ella sí que lo sabe.
She does know it.
Puede que sí, puede que no.
Maybe yes, maybe not.
Tom no podía hacerlo, pero María, sí.
Tom couldn't do it, but Mary could.
"Sí, lo hice", dijo él.
"Yes, I did," he said.