下边是我为大伙儿整理的英语四级专业知识，期待能够为大伙儿提供帮助，一起来学习一下吧。
11.15 过去完成时 1) 定义：表明过去的过去 其组成是had 过去分词组成。 那时候之前 那时候如今 2) 使用方法 a.在told, said, knew, heard, thought等形容词后的宾语从句。 She said (that) she had never been to Paris. b. 状语从句 过去不一样時间产生的2个姿势中，产生在先，用过去完成时;产生后面，用一般过去时。
When the police arrived, the thieves had run away. c. 表明意愿的形容词，如hope, wish, expect, think, intend, mean, suppose等，用过去完成时表明"本来…，无法…" We had hoped that you would come, but you didn't. 3)过去完成时的时间状语before, by, until , when, after, once, as soon as。 He said that he had learned some English before. By the time he was twelve, Edison had began to make a living by himself. Tom was disappointed that most of the guests had left when he arrived at the party.

典型性练习题
The students ___ busily when Miss Brown went to get a book she ___ in the office. A. had written, leftB，were writing, has left C. had written, had leftD. were writing, had left 回答D. "把书忘在办公室"产生在"取走书"这一以往的姿势以前，因而"忘记了书"这一姿势产生在过去的过去，用过去完成时。句中when表明的是時间的一点，表明在"学生们正忙碌……"这一情况下，when所正确引导的姿势产生。因而 前一句运用过去进行时。
留意：had no … when还没有等…… 就…… had no sooner… than刚…… 就…… He had no sooner bought the car than he sold it. 强烈推荐信息内容：