had+过去时和has+过去时的区别,还有单独是过去时,比如：said,has said,had said的区别

现在完成时和has+过去时的区别 say的过去时是不是said? 过去现在时 have /has been doing和have/ has +过去分词的区别 过去时和过去分词的区别 said的过去式和过去分词是什么? 资料上说若句中是has/ have / had +过去分词时,其反义疑问句的谓语用has/have/had进行反问. 过去分词和过去式的用法?什么时候用过去分词什么时候用过去式?还有has和had是什么?怎么用? live\was\had\did\worked\went\asked\said\stayed\ate\became的过去 he know what I said中 said必须是过去时吗,什么时候用say be+过去分词与have/has+过去分词的区别 有关过去完成时的疑问过去完成时的结构是 主语+had+过去分词她说她已经吃饭了she said that she had 法语简单过去时和复合过去时的区别?