unit 12 life is full of the unexpected
单元语法重点：1.过去完成时的构成：助动词 had (用于各种人称和数) +过去分词 when i got to school, the bell___ring).
2. 过去完成时的用法：
主要是表示在过去某个时间，或是动作之前已经发生或完成的动作。也就是过去的过去。
3. 常用的几种方式： 用介词by, before 等构成的时间短语。
welearn) 20 english songs by the end of last month.
用连词when, before, after或者短语by the time引导的时间状语从句。
the plane __take) off when i reached the airport.
by the time i got up , my brother___le**e) home.
by the time 意思是 “到…的时候”,相当于 when , 后接过去时的句子时， 主语的谓语动词用过去完成时态：by the time i got outside, the bus __already __le**e). 我出去的时候，公共汽车已经开走了。
sectiona 一根据汉语提示完成单词。 1. i got to school late because i （睡过头）this morning.
2. when i got home, i realized i had (遗忘)my english book at school.
3. it’s cold (在外面), you’d better wear more clothes. 4.
when i got to school, i （意识到）i forgot to bring my homework.
5. you’d better put your homework in your背包).
6. i got up early this morning because i didn’t want to __错过) the early bus.
7. the drop in prices was quiet __出乎意料的).
8. the __工人) fell down and got hurt.
9. the plane was flying __在上面) the clouds.
10. the river goes through the city from __西) to east.
二、短语1. 到---时候___2. 起床 __3. 洗澡___4.把某物忘在某___
4. 充满5. 发出声音___6.捎某人一程 __7.即将做某事___8.尽管，即使9. 难以置信10.起飞。
三、单项选择。
1. tom drove by and g**e me a __on the way home.
a. flight b. run c. walk d. lift
2. when i got to the cinema, the movie __for five minutes.
a. began b. had begun c. had been on d. has been on
3. she will be a nurse __she graduates from the school.
a. by the time b. at this time c. at that time d. at a time
4. the alarm is __there must something wrong with the car.
a. going on b. going by c. going off d. going down
5. i __this morning and missed the early bus.
a. overslept b. slept c. held d. caught
6. miss lee didn’t __our party because she forgot.
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