Mary thought for a minute , then she knew what her mother wanted her to buy . What is it ?
2 . Mary asked her mother how many she needed to buy . Her mother said . “The number is between one and ten . If you double the number , the result will be the same as if you added two to it . What is the number ? ”
3 . Two women went shopping . One spent ten dollars more than the other , and tog 《九年级英语第二十一单元(第5页)》出自：www.89xue.com网
www.89xue.com ether they spent forty dollars . How much money did each of them spend ?
答案：1 . apple 2 . two 3 . One spent fifteen dollars and the other spent twenty - five dollars .
三、智能显示
【 心中有数 】
单元语法发散思维
过去完成时态
过去完成时由“助动词 had ( 用于各种人称和数 ) + 过去分词”构成。主要表示在过去某一时刻或某一动作之前就已经完成或发生的动作或存在的状态。
这个时态常用 by 或 before 等引出过去的某一时刻，也常用状语从句或上下文表示过去的某一动作。其句型结构简见下表：
动词 be
动词 do
肯定式
By then I had been there .
By nine o\'clock last night she had done the work .
否定式
By then he had not yet been there .
By nine o\'clock last night I had not yet done the work .
疑问式
Had they been there by then ?
Had you done the work by nine o\'clock last night ?
基本用法：在过去某一时刻或某一动作之前已经完成或发生的动作或存在的情况。如：
I had learned 1000 English words by the end of last term . 在上学期结束时，我已学了一千个英语单词。
They still hadn\'t finished the work by Friday .
表示某个动作或状态一直延续到过去某一时刻。
It had snowed for an hour when the train arrived .
The old man died when the doctor arrived . ( 即老人的死是在医生到达的时候，或者刚刚到达之后 )
The old man had died when the doctor arrived . ( 即医生到达时，老人已死了 )
叙述比过去情况更早的动作或状态。
I found the watch I had lost .
【 动手动脑 】
单元能力立体检测
Ⅰ . 词汇：
用所给单词的适应形式填空：
1 . ______ ( luck ) , he didn\'t hurt badly .
2 . The ______ ( forty ) room is mine .
3 . Jack can jump ______ ( far ) than Jim .
4 . The door bell was ringing while he fell ______ ( sleep ) .
5 . The old man has been ______ ( die ) for half a year .
Ⅱ . 选择填空
1 . My father was busy ______ the car for his son .
A . to mend B . mend C . mends D . mending
2 . There are nine _______ students in their school .
A . hundred B . hundreds C . hundred of D . hundreds of
3 . None of you read _______ .
A . carefully enough B . careful enough C . enough carefully D . enough careful
4 . Kate\' sweater ______ , please buy a new one for her .
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