Questions & Answers about Si estàs lliure a la tarda, quedarem al banc de la plaça.
Because lliure here means free/available at that moment, which is treated as a temporary state. In Catalan, temporary states usually go with estar, not ser.
So:
- estàs lliure = you’re free / available
- ets lliure would sound less natural here
This is similar to other temporary conditions:
- Estic ocupat = I’m busy
- Està cansada = She’s tired
Here lliure means free in the sense of available.
It does not mean something like free of charge here. It is about whether someone has time.
So Si estàs lliure a la tarda means:
- if you’re available in the afternoon
- if you’re free this afternoon / in the afternoon