Students must get up an walk around the room, form questions based on the activities using the present perfect. They then write the answer/name of who they asked, for example for number one they may write "si, Pepe." After completing the survey I have students write a summary on their classmates. When done properly, this should take a minimum 30 minutes depending on class size. I have 23 this year in 4H and it takes them over 30 minutes.