Have you ever ________ (buy) or ________ (sell) anything on eBay? What? Did you pay or get a good price?
Have you ever bought or sold anything on eBay? What? Did you pay or get a good price?
Have you ever ________ (buy) something online and had a problem with it? What was it? What did you do?
Have you ever bought something online and had a problem with it? What was it? What did you do?
Have you ever ________ (have) an argument with a shop assistant? What was it about?
Have you ever had an argument with a shop assistant? What was it about?