This was SUCH a fun activity to get my students speaking IMPROMPTU in Spanish in the past tense! Here is how the activity works: Two students who have "committed" a crime (crime decided by the class in Spanish) go outside the room and come up with a joint alibi. Meanwhile, the rest of the class prepares general questions to ask them. When the students come into the group, the class is divided into two groups and each student takes a group. The group then interrogates each student in Spanish using the worksheet. Eventually, the two students' stories won't add up, and they will be proven guilty! I love this worksheet because it gives the students fun vocabulary related to police interrogation, and it helps outline how to form questions in the past tense in order to interrogate. WE HAD SO MUCH FUN!