A conversation to practise new words

Thinking over and over an activity that students in a fourth class could do at the beginning of the school year,  both to revise some of the grammar structures studied in the previous years and to learn new words and expressions while improving their speaking skill, I've had an idea that has proved to be successful.
Students have been asked to make a conversation in groups of four, using modal verbs and the words that they have learnt, while watching a video on the plot of Romeo and Juliet.

The conversation was about the following situation: the character of the Nurse tries to persuade Juliet to marry Count Paris and she replies saying that she can't and giving her reasons.