Today we talked about professions and careers.

We were practicing simple questions like: What does a mechanic do? A mechanic fixes cars.

We learned some new adjectives to describe work or jobs or activities related to a job: challenging, rewarding, nerve-racking, fascinating, exciting, awful.
We were using gerund phrases as subjects or objects in a sentence, i.e. working on a movie set must be very challenging.

We read a dialogue which we´ll practice next day.
Since we were talking about jobs we are considering and don´t actually have we used the forms: would be, could be, must be.