Student A engages in a role-play activity with Student B about his best friend Donald. Student A provides details about Donald such as what he used to call him, how thin he used to be, their favorite weekend activity of cycling together, and where Donald now studies. The exercise asks students to compare aspects of their best friends from the past to the present using the phrase "used to" based on notes provided about changes in shyness, schools attended, kindness, exercise habits, work ethic, friendliness, and places of residence.