I was given an answer that goes:<br/><br/><b>Answer: I left school 2 years ago, when I finished my IB Exam. (since)<br/></b><br/>And I am asked to create what the question might have been in the form of present perfect using since.<br/><br/>Is the following a correct one? Please advise, thx soooo much!<br/><br/><b>Question: Since when have you left school? <br/></b>