Different types of students attend class. Some would be naturally talkative., others will speak if spoken to. Further, there will be the ones that are reticent to various approaches. You will realise the balance of the class in the first few sessions and should plan your lessons and games accordingly. As a teacher, you should approach even the most reluctant student to come out of their shell. And if you knock on a door a few times, it will always open. Be available and approachable.