初中英语语法状语从句课件(共45张PPT)

(共45张PPT)
状语从句
He went home at 8:00 last night.
He didn't go home until his mather called him.
功能:
形式：
作状语
句子
状语从句在句子中充当状语，表示主句动作发生的时间、地点、条件、方式、目的、结果、让步、原因、比较等。
公式：
主句+状语从句连接词+从句
=状语从句连接词+从句，主句
一、 时间状语从句
1. when, while, as
当A句…的时候，B句…
当手机发明的时候，没有人意识到它的危害性。
When mobiles were invented, no one realized their hazard.
=No one realized their hazard when mobiles were invented.
2. as+A句,B句=B句+as+A句
【随着A句…,B句…】
随着越来越多的小孩接触互联网，父母开始担心互联网对他们孩子的影响。
As an increasing number of children are having access to the Internet, parents start to concern the influence which the Internet poses on their children.
3. while+A句,B句=B句+while+A句
在A句……期间， B句……
补：while在雅思中多用于表示转折。
Some people think…while others argue…
Animals make huge contribution to the medical breakthrough while they violate animals’ basic rights.
4. Before, after
1）Before+A句,B句=B句+before+A句/时间词
【在A句…之前，B句…】
2）After+A句，B句=B句+after+A句/时间词
【在A句..之后，B句…】
在广告发明之前，人们获得产品信息的方式主要通过与其他人之间的交流。
Before advertising was introduced, the major channel by which people get informed of product information had been to communicate with other consumers.
这个数据在下降到1990年的20%之前，它先上升到1980年的80%
Before the figure jumped to 20% in 1990, it increased to 80% in 1980.
5. A句+since+B句/时间短语
【自从B句…,A句就…】
自从手机发明以来，人们的生活发生了巨大变化。
People’s lives have undergone dramatic change
since mobiles were invented.
6. A句+until+B句/时间短语
【A句…直到B句…】
The little boy kept crying until he saw his mother.
= The little boy did not smile until he saw his mother.
not…… until “直到……才……”
直到星球破坏了，人类才意识到环保的重要性。
Humans did not realize the importance of environmental conservation until the planet was destroyed.
where引导
A句+where+B句
在B句…地方, A句…
在环境污染严重的地方，许多珍稀物种处于灭绝的边缘。
Many rare animals are on the verge of extinction where environmental pollution is serious.
二、地点状语从句
三、条件状语从句
If引导的条件句
Unless
Once
As long as
1）真实条件句
如果过分沉迷于打游戏机，肯定会与家人和朋友缺乏足够的感情交流。
If someone overindulges in playing computer games, he is sure to lack emotional contact with his family members and friends.
2）虚拟
*现在的虚拟：
A句:were/did, B句：would/could/might do
If I were you, I would choose to work in a small town.
*过去的虚拟：
A句:had done, B句:could/might/ would have done
假如他起床早点儿，就会赶上那趟公交了。
If he had got up earlier, he would have caught up the bus.
四、原因状语从句
原因状语从句的常见连词：because, for, since, as, now that,等。
由于学生处于成型期，他们有时不能辨明是非。
In one’s formative years;
Distinguish right from wrong;
Since students are in their formative years, sometimes they cannot distinguish right from wrong.
由于人们对这热点话题持有许多不同观点，一场激烈的争论在所难免。
A fierce argument is inevitable because people hold many different views on this hot topic.
五、目的状语从句
A句+in order that+B句
A句+so that+B句
【A句…是为了B句…】
为了身体健康，我们应该避免吃含有高脂肪高热量的食物。
We should avoid eating food with high fat and
high calories so that we can stay healthy.
七、结果状语从句
So…that
Such…that
she was so foolish that she trusted his words.
=She was such a fool that she trusted his words.
社会竞争太激烈了，以至于许多人患有失眠症和抑郁症。（ insomnia ， depression ）
The social competition is so fierce that many people suffer from insomnia and depression.
比较：
I got up early so that I could catch up the early bus.
I got up so early that I caught up the early bus.
八、让步状语从句
although/though
尽管互联网技术被广泛用于教学，但是传统教学的作用是不可取代的。
Although the Internet technology is widely used in classroom teaching, the role of traditional teaching cannot be replaced.
9. 比较状语从句
1）as…as 意为“和……一样……”，as后面接形容词、副词的原级；
Chinese is as_beautiful_a_language_as_English.(和英语一样漂亮的语言)
2）not as/ so…as … 意为“不如……；不及……”；
They didn't come to school as_early_as_we.(和我们一样早)
3）than 意为“比……更……”；
The boy is taller_than_his_father. (比他的父亲还高)
4）比较状语从句通常与倍数表达法结合起来运用。
①A +is…times +as+ adj.原级+as +B
②A +is…times+ adj.比较级+than +B
③A +is…times+ the size/length/height/width/depth +of + B
④The size/length/height/width/depth… +of+ A+ is…times of +B
练:中国2012年的石油进口是2008年的两倍。
中国2012年的石油进口是2008年的两倍。
The End
状语从句
分词作状语
这个数据在下降到1990年的20%之前，它先上升到1980年的80%
Before the figure jumped to 20% in 1990, it increased to 80% in 1980.
Before jumping to 20% in 1990，the figure increased to 80% in 1980
状语从句
时间 原因 条件 让步 地 点 目的 方式 结果 比较
①判断主从句主语是否一致
②去从句主语
③从句谓语变分词
Before the figure jumped to 20% in 1990, it increased to 80% in 1980.
Before jumping to 20% in 1990，the figure increased to 80% in 1980
If students play computer games all the time, they are likely to lack emotional contact with their family members.
(If) Playing computer games all the time, students are likely to lack emotional contact with their family members.
分词有语态的变化
练：
当孩子在家中受到虐待时，
他们会产生行为问题。
When children are exposed to abuse at home, they may have behavior problems.
①主语是否一致
②去从句主语
③从句谓语变分词
(When) Exposed to abuse at home, children may have behavior problems.
The End