When 4th ESO hear these famous words, they know that they will have an opportunity to do some speaking practice. The success of the activity depends on a few things: giving them a task within their ability range with specific objectives and, of course, their own motivation and desire to complete it.
The advantage of this type of task is that students share knowledge with each other, rather than solely with the teacher. 4th ESO have been practising 'modal verbs'. Using them at any level is a great way to improve your language skills, as they are extremely common in both spoken and written English.