Unit12 Life is full of the unexpected. 过去完成时知识点及练习（含解析）人教版英语九年级全册

Unit 12 Life is full of the unexpected
重点单词：unexpected, kick, block, oversleep, burn, announce, embarrassed, cancel, believable 等。
重点短语：be full of, give a lift, end up, in line with, show up, sell out, by the time等。
重点句型：before，by the end of last year，by the time 引导的时间状语从句。
语法要点：过去完成时had done的构成和用法；时间状语从句与主句的时态搭配。
【过去完成时】
过去完成时：表示过去某一时间或动作以前已经发生或完成了的动作。它表示动作发生的时间是“过去的过去”。表示过去某一时间可用by, before等构成的短语，也可用when, before等引导的从句或通过上下文提示等。
过去完成时的构成：
1）过去完成时基本构成形式: had +过去分词。
The train had left when I arrived at the station this morning.
2）过去完成时的否定形式: had + not + 过去分词。
John hadn’t went to bed when his parents got home at the midnight of yesterday.
3）过去完成时的一般疑问句及其回答形式:
疑问句要把had提到句首；回答用Yes, 主语+ had. / No, 主语+ hadn’t.
—Had he told you the place before the meeting was held yesterday
—Yes, he had. (No, he hadn’t.)
过去完成时的用法：
a.在told, said, knew, heard, thought等动词后的宾语从句。
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.　
had written, left　 B，were writing, has left　
C. had written, had left　 D. were writing, had left
解析："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。答案D
At the end of the meeting, it was announced that an agreement (reach).
解析：会议结果宣布之前，已经达成了一致。答案had been reached
【巩固练习】
I. 语法选择。
1. When I arrived at the station, the train _____ already.
A. left
B. has left
C. had left
D. leaves
2. By the time he came back, we _____ the work for hours.
A. had done
B. have done
C. did
D. are doing
3. She _____ her homework before her mother came back last night.
A. has finished
B. finished
C. had finished
D. will finish
4. They _____ the bridge by the end of last year.
A. have built
B. built
C. had built
D. were building
5. He _____ the book for three weeks before he returned it to the library.
A. has kept
B. kept
C. had kept
D. keeps
6. By the time she got to the airport, her flight _____.
A. had left
B. left
C. was leaving
D. had been left
7. We _____ our dinner when the phone rang.
A. had just finished
B. have finished
C. finished
D. were finishing
8. Before he stepped out of the house, he _____ a note on the table to his parents.
A. had left
B. has left
C. was leaving
D. had been left
9. She _____ her homework before she went to bed last night.
A. had done
B. has done
C. did
D. was doing
10. When I got to the office, the meeting _____ for half an hour.
A. had been on
B. has begun
C. has been on
D. had begun
11.By the time she got to the park, the concert _____ started.
A. had already
B. has already
C. already had
D. was already
12.He _____ his homework when his mother came in.
A. had just done
B. had just finished
C. just had finished
D. just finished
13.I _____ the book for two weeks before I decided to return it.
A. kept
B. have kept
C. had kept
D. am keeping
14.By the end of last month, they _____ 10,000 trees.
A. had planted
B. planted
C. have planted
D. were planting
15.She _____ her luggage before checking in at the hotel.
A. had packed
B. packed
C. has packed
D. was packing
16.They _____ the game before the rain started.
A. finish
B. finished
C. had finished
D. will finish
17.When we arrived, the concert _____ for ten minutes.
A. had been on
B. has been on
C. was on
D. had been
18.She _____ her speech before the audience arrived.
A. had prepared
B. prepared
C. has prepared
D. is preparing
19.By the time I got to the station, the train _____ left.
A. has already
B. already had
C. had already
D. was already
20. He _____ his homework before he went out to play football.
A. had finished
B. finished
C. has finished
D. will finish
参考答案：
1、答案：C
解析：句子中“arrived”是过去时，而“left”的动作发生在“arrived”之前，所以使用过去完成时。
2、答案：A
解析：by the time引导的时间状语从句中，如果主句是过去时，从句中的动作发生在主句动作之前，则从句用过去完成时。
3、答案：C
解析：last night表明是过去时间，且“finished”发生在“came back”之前，故用过去完成时。
4、答案：C
解析：by the end of last year表明是过去的某一时间点之前完成的动作，故用过去完成时。
5、答案：C
解析：for three weeks是表示一段时间的持续，且该动作发生在“returned”之前，故用过去完成时。
6、答案：A
解析：动作发生在到达机场之前。
7、答案：A
解析：电话响时，饭刚吃完。
8、答案：A
解析：离开前留下的纸条。
9、答案：A
解析：睡觉前已完成作业。
10、答案：A
解析：到达时会议已开始半小时。
11、答案：A
解析：句子中使用了“By the time she got to the park”，表示到达公园的时候，音乐会已经开始了。这里需要使用过去完成时来表示“音乐会开始”这一动作发生在“到达公园”之前。正确形式应为“had already started”，但选项中未直接给出完整的动词形式，但从语法结构和语境上判断，A选项“had already”后应接动词的过去分词形式，故A为正确答案。
12、答案：B
解析：句子描述的是他妈妈进来时，他刚刚完成作业。由于“came in”是过去时，且“完成作业”发生在“进来”之前，所以应使用过去完成时。同时，“just”用于强调动作的刚刚完成，常与“had finished”搭配使用。
13、答案：C
解析：句子中提到“在我决定归还之前”，说明“保留书籍”这一动作发生在“决定”之前，且持续了两周时间。因此，应使用过去完成时来表示这一持续性的过去动作。
14、答案：A
解析：“By the end of last month”表明是过去的某一时间点之前完成的动作，因此应使用过去完成时。
15、答案：A
解析：“checking in”是过去时，且“打包行李”发生在“入住”之前，所以应使用过去完成时。
16、答案：C
解析：“the rain started”是过去时，且“完成游戏”发生在“下雨”之前，故用过去完成时。
17、答案：A
解析：“arrived”是过去时，且“音乐会进行”是一个持续性的动作，在“到达”之前已经持续了十分钟，所以应使用过去完成时的进行时态。
18、答案：A
解析：“the audience arrived”是过去时，且“准备演讲”发生在“观众到达”之前，所以应使用过去完成时。
19、答案：C
解析：“By the time I got to the station”表明是过去的某一时间点之前完成的动作，且“left”是动词，需要与助动词“had”搭配形成过去完成时。同时，“already”用于强调动作的完成。
20、答案：A
解析：“went out”是过去时，且“完成作业”发生在“出去玩”之前，所以应使用过去完成时。