过去时和过去完成时问题Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别?

过去时和过去完成时问题Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别? he was very ill before he died为什么he was very ill先完成的动作不用过去完成时,用过去时? 如何准确区别过去时和过去完成时? 什么时侯用过去时和过去完成时 有关after+过去时或过去完成时的问题After he was arrested,the man admitted hiding in the box before the plane left.和After he had been arrested,the man admitted hiding in the box before the plane left.在意义上有什么不同吗?为 过去时和过去分词什么区别啊``过去完成时呢? 过去时和完成时问题Before he retired ,he was the head of the factory.与before he retired ,he had been the head of the factory.哪个正确?如都正确,有什么区别? before后面要用过去完成时是怎么个情况?since后面一定要用过去时么? 用时态的问题When I woke up this morning,my brother ___________in the bathroom 用过去完成时还是过去进行时 为什么?还有 He ____(冲)to the door when he heard the news第一题正确答案是过去完成时 一般过去时 过去进行时 和过去完成时的用法 怎样区分 过去进行时,一般过去时,现在完成时,过去完成时?和用法 过去完成进行时和过去完成时有什么区别? 英语过去时和过去完成时应该怎么区分?举例说明 （在线等）请以给出的句子为例讲解过去完成时和过去完成进行时!原句：He had lived in Scotland for fifteen years before he came to England.能否把had lived换成had been living?如果能的话意思是否发生改变?过 过去完成时过去时具体区分 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? 动词时态问题,一般过去时和一般完成时的区别是什么?还有如果单选题中选过去完成时的话一定要有一般过去时即“过去的过去”吗 现在完成时的过去式和过去完成时怎么区分比如I had never been on a plane before.是不是没有提到过去具体某时以前就是过去完成时是不是没有提到过去具体某时以前就不是过去完成时