

¿Quieres café? Sí, gracias.
[¿ˈkjeɾes kaˈfe? ˈsi, ˈɡɾaθjas.]
Do you want coffee? Yes, thank you.
Creo que sí.
[ˈkɾeo ke ˈsi.]
I think so.
¡Sí, claro!
[¡ˈsi, ˈklaɾo!]
Yes, of course!
"sí" is in the lesson "Conversation" (Level 36), along with 15 other useful words. LinDuo has 180 topic lessons like this one, 2,369 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.