have stayed 和 had stayed的区别？

have stayed 现在完成时态，have+过去分词，表示过去发生的事情，现在仍然在持续着。而 had stayed 是过去完成时态。表示事情发生在 “ 过去的过去”， 与现在没有任何关系。He has travelled over many lands.（现在完成时态）句意：他到过许多国家。（结果：他见识很广）桥饥Peter had finished his homework before supper. ( 过源陵去完成时态）雹消戚句意：彼得在晚饭前把作业做完了。