A. 不知道或不必说出动作的执行者初中英语语法练习题
How is this word pronounced 这个单词怎么发音？
Scientists say that work is done whenever a force moves. 科学家们说，力移动时就做了功。
A greater number of magic English books will be published next year. 明年将有更多的魔法英语书出版。
After war, everything had been destroyed. 战争结束后，一切都被毁坏了。
B. 强调动作的承受者
If you break the school rules, you will be punished. 如果你违反校规，你将受到惩罚。（强调you）
A new Hope School will be opened in our village. 我们家乡将开办一所新的希望学校。（强调a new Hope School）
She is liked by everybody. 大家都喜欢她。
Xiao Li was elected monitor of the class. 小李被选为班长。
C. 动作的执行者不是人而是无生命的事物
The bridge was washed away by the flood. 桥被洪水冲走了。
We were shocked by the news of his death. 我们听到他的死讯极为震惊。
Many accidents were caused by careless driving. 许多事故都是开车不小心造成的。
D. 修辞的需要，为了使句子更加简练、匀称
He appeared on the stage and was warmly applauded by the audience. 他出现在舞台上，受到了英语记单词方法观众的热烈鼓掌。
The old professor gave a lecture on American history and was well received. 这位老教授作了一个有关美国历史的讲座，受到大家的热烈欢迎。
I was shown round the school campus by Sean, who had entered the school just a year before. 肖恩带我参观了校园，他去年刚进这所学校。
E. 为了表示委婉或礼貌，避免提及动作执行者或说话者自己
You've been told many times not to make the same mistake. 你已被多次告知不要犯同样的错误。
Everybody is expected to obey the following rules. 希望大家遵守以下规定。
The control room may not be entered without permission. 非经许可，勿入控制室。
F. 科技文献中为了客观地描述事情及其过程
The film is coated with light-sensitive chemicals, which are changed by the different shades and colours of light. 胶卷上涂了一层感光的化学物质，这些物质因光的不同色度与颜色而改变。
G. 新闻报道中为了体现我是单词王新闻的客观性
The west-east gas pipeline project was kicked off on July 4, a big event in the nation's west development campaign. 西气东输工程7月4日全线开工，这是国家西部大开发战略的一件大事。
H．有些动词习惯上常用被动语态
He was born in this city. 他出生在这个城市。
The school is situated in the suburbs. 这所学校位于郊外。
注意：
被动语态中的by短语通常可以省去。但如果by短语是句子的重点所在，或者没有by短语全句的意思不完整时，则要保留by短语。
The vegetables didn't taste very good. They had been cooked too long. 蔬菜的味道不好，烧的时间太长了。（不需要动作的执行者）
He arrived at the airport, where he was met by his friend. 他到达了机场并受到朋友的迎接。（没有by his friend，句子的意思不完整）
Everybody was cast down by such news as that. 大家都被那种消息搞得很沮丧。（需要by短语）
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