When do you use 知道关于and when do you use 听说过, are they always interchangeable? When do you use 知道关于，and when do you use 听说过, are they always interchangeable? In my last notebook I had different corrections, some said 你知道关于英格兰罗宾汉的传奇 but others started 你听说过英格兰，Is there any difference between the two？