英语语法的十六种时态(续)

过去完成时
a.　　 She said (that) she had never been to Paris.
　b. 状语从句
　　在过去不同时间发生的两个动作中，发生在先，用过去完成时；发生在后，用一般过去时。
　　 When the police arrived, the thieves had run away.
　c. 表示意向的动词，如hope, wish, expect, think, intend, mean, suppose等，用过去完成时表示"原本…，未能…"
　　 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.

典型例题　
　 the students ___ busily when Miss Brown went to get a book she ___ in the office.　
A. had written, left　B，were writing, has left　 C. had written, had left　D. were writing, had left
　答案D. "把书忘在办公室"发生在"去取书"这一过去的动作之前，因此"忘了书"这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在"同学们正忙于……"这一背景下，when所引导的动作发生。因此
前一句应用过去进行时。

注意：　had no … when　　　　　还没等…… 就……
　　　　had no sooner… than　　刚…… 就……
　 He had no sooner bought the car than he sold it.
用于现在完成时的句型

1）It is the first / second time…. that…结构中的从句部分，用现在完成时。
　 It is the first time that I have visited the city.
　 It was the third time that the boy had been late.

2）This is the… that…结构，that 从句要用现在完成时.
　 This is the best film that I've (ever) seen.
　　　这是我看过的最好的电影。
　 This is the first time (that) I've heard him sing.　这是我第一次听他唱歌。

典型例题
(1) ---Do you know our town at all?　
　 ---No, this is the first time I ___ here.
A. was　 B. have been　 C. came　 D. am coming
　答案B. This is the first time 后面所加从句应为现在完成时，故选B。

(2) ---Have you ____ been to our town before?
　 ---No, it's the first time I ___ here.
A. even, come　 B. even, have come　　C. ever, come　 D. ever, have come
　答案D. ever意为曾经或无论何时，反意词为never，此两词常用于完成时。 This is the largest fish I have ever seen. It is / was the first time +that-clause 的句型中，从句要用完成时。
　注意：非延续性动词的否定形式可以与表示延续时间的状语连用。即动作不发生的状态是可以持续的。
（错）I have received his letter for a month.
（对）I haven't received his letter for almost a month.

独立主格结构的特点：
　　1）独立主格结构的逻辑主语与句子的主语不同，它独立存在。
　　2）名词或代词与后面的分词，形容词，副词，不定式，介词等是主谓关系。
　　3）独立主格结构一般有逗号与主句分开。
举例：
　　the test finished, we began our holiday.
　= When the test was finished, we began our holiday.
　　考试结束了，我们开始放假。
　　
　　the president assassinated, the whole country was in deep sorrow.
　= After the president was assassinated, the whole country was in deep sorrow.
　　总统被谋杀了，举国上下沉浸在悲哀之中。

　　Weather permitting, we are going to visit you tomorrow.　
　　如果天气允许，我们明天去看你。
This done, we went home.　　　
　　工作完成后，我们才回家。

　　the meeting gone over, everyone tired to go home earlier.　
　　会议结束后，每个人都想早点回家。

　　He came into the room, his ears red with cold.
他回到了房子里，耳朵冻坏了。
　　
　　He came out of the library, a large book under his arm.
　他夹着本厚书，走出了图书馆新开千年私服了!奇迹私服

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