Use this practice/game after teaching the difference in using present perfect and past simple tenses. Two groups of students. A asks B the question Have you ever.........? (1st page); B answers either No, I have never....... (elicit using this structure for the negative answer), or the answers is "Yes", then A keeps asking for some details using Wh- words (2nd page) and past simple questions. Make As ask more then 1 question.The groups switch every round. It is fun :)