For example and for instance are completely interchangeable, so it is just a matter of personal preference as to which you decide to use: '* There are a number of rules you must abide by. For instance, you may not use the swimming pool unsupervised.' '* You have all made silly mistakes on this trip. John, for example, failed to secure the boat properly and Adam took the jet ski out when the sea was far too rough

please when anyone put -1 -2 -3.........he has to say why ,to learn from our mistakes and to aquire more knowledge.thanks alot

Example and instance are very similar and sometimes can be used interchangeably, however NOT always. We often say: Please give me an example! Those examples are not good. But it is infrequent for us to say: Please give me an instance! Those instances are not good.