内容正文:
Unit4 Then and now
专项练习5 重难点突破题
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一、could 的用法
解析
could是情态动词can的过去式,意为"能;可以;会",后接动词原形,表示某人过去会做某事。
1.肯定句结构:主语+ could+动词原形(+其他).
例句: My father could drive cars three years ago. 三年前,我的爸爸会开小汽车。
2.否定句结构:主语+ could not/couldn't+动词原形(+其他).
例句: I couldn't speak English four years ago. 四年前我不会说英语。
The baby could not walk by himself. 这个宝宝还不会自己走路。
3.一般疑问句结构:Could+主语+动词原形(+其他)?
肯定回答: Yes,主语+ could. 否定回答: No,主语+ couldn’t.
例句:-Could the boy do the high jump three years ago? 三年前这个男孩会跳高吗?
- Yes, he could. /No, he couldn't. 是的,他会。/不,他不会。
4.特殊疑问句结构:特殊疑问词+ could+主语+动词原形(+其他)?
例句: What could you do on the Internet two years ago? 两年前你可以在网上做什么?
Where could Mr Brown use the telephone then? 过去布朗先生可以在哪里使用电话?
跟踪练习
一、按要求完成句子。
1. I could write to my friends five years ago. (改为一般疑问句)
________ ________ ________to ________ friends five years ago?
2. He could swim and skate last year. (改为否定句)
He ________ swim ________ skate last year.
3. Mr Green could play badminton well twenty years ago. (对画线部分提问)
________ ________ Mr Green ________ well twenty years ago?
4. Su Yang could make clothes with old newspapers. (对画线部分提问)
________ ________ Su Yang ________ clothes?
5. The little boy could draw a tiger at the age of three. (对画线部分提问)
________ ________the little boy ________ at the age of three?
二、一般过去时与一般现在时的比较
解析
时态
一般过去时
一般现在时
用法
表示在过去某个时间发生的动作
或状态等。
表示通常性、规律性、习惯性、事实性的
动作或状态。
时间状语
last … ,… ago, yesterday, just now,
in 2002 …
once a week, every …, on Saturdays/Sundays,
twice a month …
频度副词 always, usually, often, sometimes, never 通常用于一般现在时,但有时也可用于一般过去时。
例句: He always worked into night those days. 那些日子他总是工作到深夜。
The teacher got very angry in class this morning. 老师今天早上在课堂上很生气。
She has a dancing lesson every Wednesday. 她每个星期三有一节舞蹈课。
The Earth goes round the Sun. 地球绕着太阳转。
跟踪练习
二、(一)用所给词的适当形式填空。
1. Nancy ____________(not do) cleaning on time yesterday.
2. I _____________(lose) my new bike in the park last Saturday.
3. The dress __________(fit) me well last year. But it _________(be) too short now.
4. H