是用过去完成时和过去时都行吗I had left it on a chair beside the door and now it wasn't there!视频讲解中说,放包发生在丢包之前,发生在过去的两个动作,在前的使用过去完成时,这个我懂,但是,下面这句In

是用过去完成时和过去时都行吗I had left it on a chair beside the door and now it wasn't there!视频讲解中说,放包发生在丢包之前,发生在过去的两个动作,在前的使用过去完成时,这个我懂,但是,下面这句In I have already seen it.不是过去的事情吗?怎么会是现在完成时?过去完成时I had already saw it.我现在都有点迷糊了.无论是过去完成时或者现在完成时?反正是完成时就用过去分词?而对于过去式就是用 i had called you last monday!这里用过去完成时,是过去的时间词没错吧 until 和过去完成时的的用法he stayed here until i came back和he had stayed here until i came back有什么区别?过去完成时是过去时的分支还是完成时的分支? The police had been told that a bomb had been planted on the plane.我认为前面应该用过去时,后面用过去完成时,为什么前后都用过去完成时 过去时和过去完成时到底怎么用?举例我觉得每一句话都可以用过去完成时,因为都是过去完成的动作.例句：“我刚才已经启动了第二台发电机”I had already started the second alternator just now.还是 why did you ask Lily for help?he asked改为间接引语答案上是He asked why you had asked Lily for help.为什么要用过去完成时呢?直接用过去时不行吗? 英语时态中,过去完成时和现在完成时有区别是什么?事情发生在过去的过去,使用过去完成还是现在完成?嗯.比如when I arrived at the playground,the game___.是用has started还是had started? 什么时侯用过去时和过去完成时 It had been many years since my wife and I had gone dancing it + 过去完成时 + since + 例句：it + 过去完成时 + since + 过去完成时为什么不是it + 过去完成时 + since + 过去式?真的是it + 过去完成时 + since + 过去 yesterday 可以用过去完成时吗I had shipped the goods yesterday .语法对吗用过去完成时,还是只能用过去时态 That was the first time (that) I had been in Rome.为什么用过去完成时?“第一次”和“到罗马”怎样体现出过去的过去? Many a student _______ that mistake before.是had made 还是has made?before不是过去时的标志吗?had made过去完成时放在句子中不行吗? 求学霸讲一下过去完成时和过去完成进行时 还有什么时候用have 什么时候用had I waited until he had finished his homework.请问这句的过去完成时为何是用在fininsh上面,为何不是wai过去完成时不是说两个动作都发生在过去,其中早发生的用过去完成,晚发生的用一般过去时,在这句话 I waited until he had finished his homework.请问这句的过去完成时为何是用在fininsh上面,为何不是wai过去完成时不是说两个动作都发生在过去,其中早发生的用过去完成,晚发生的用一般过去时,在这句话 我不是很了解一般过去时和过去完成时有什么区别?我知道他们各自是做什么的.但是不知道这两句句子有毛病没I had finished my homework before lunch -- 过去完成时I finished my homework before lunch -- 过去 my husbnad and i had been married 30 years. 如何理解用过去完成时的被动时态.过去完成时不是指过去的过去吗.但这里感觉不到吖