The classes are structured around a topic to enable everyone to have a chance to speak, even if they are attending for the first time and don’t know the other participants. Past topics and the tutor’s questions are available inside the site, and can help you prepare for that week’s topic. When you see the questions, you will see that intermediate questions are asking you to use past tenses, the future tense and sometimes the conditional, whereas the advanced class takes you into subjective opinion, desires and other areas that demand more advanced grammar.
Although there is a structure to the class, the tutor will let it run if it develops into a natural conversation in which everyone has a chance to speak.