You walk around and assist and monitor. Write down grammatical mistakes that you hear. Then, use the last 10 minutes of the class period to put some of these mistakes on the board for error correction with the class. Give each student a card. Each of the cards should have a different question on it, but if you have a really big class, you could double up on questions.
Students stand up and each find someone to ask their question to.
They take turns asking and answering the questions in their new-found pairs. Then, they exchange cards and find another partner, and the process repeats. Instruct students that they are going to walk around the room and survey seven of their classmates on their question. Encourage them to develop their own follow-up questions. They may take notes as they listen to their classmates' responses.