This is the 3261st most frequent Catalan word.
surti
"Surti" is a form of the verb "sortir" in Catalan, meaning "to go out" or "to leave."
In this sentence, 'surti' is the present subjunctive form of the verb 'sortir' (to leave) used to express hope or desire for the subject to leave on time.
Espero que surti a temps per agafar el tren.
I hope she/he/it leaves on time to catch the train.
Here, 'surti' is again in the present subjunctive form of 'sortir', used to denote an event that happens dependent on another event, specifically 'when the sun rises'.
Quan surti el sol, anirem a la platja.
When the sun rises, we will go to the beach.
'Surti' in this sentence is used in a subordinate clause following an expression of desire ('no vull'), demonstrating its subjunctive nature in Catalan.