- Start of Unit 4: Facing Problems, students answer the following questions: 

1. What is a problem you are facing at university?
2. Do you have a problem-solving strategy?
3. How do you deal with stress?
4. What do you consider a major problem in Chile today?
5. What do you consider a historic problem in Chile?

- Uses of "have to, must, and should" to express obligation and advice. Students watch the video about the use of these modal verbs.

- Later, students do the exercises to apply the use of "have to, must/mustn`t, and should."