Van a which means they are going to go
no creo que puedas, lo siento mucho
The subjunctive mood is used to talk about desires, doubts, wishes, conjectures, and possibilities. For example
1. My mom wishes I would not drive in the rain
4. My grandfather hopes that we will come to the party
The indicative mood is used to talk about facts and other statements that are believed to be true and concrete. For example
2. It's obvious they are going to drive to the airport
3. It's certain that we will all fit in the van.
