Question

9. Change the verb to indicate that it is an activity that is currently in progress.

Ellos no pagan por el boleto.

Answer 1

Ellos no están pagando por el boleto.

Answer 2

if we change the verb to indicate that it is an activity that is currently in progress, the sentence will become :
Ellos no estan pagando por el boleto , which means that they're not paying for the ticket

hope this helps