【一般现在时被动语态讲解及练习ppt课件】一、什么是被动语态？
在英语中，句子的结构可以分为主动语态和被动语态。
- 主动语态：强调动作的执行者（主语是动作的发出者）
例如：Tom eats an apple.（汤姆吃了一个苹果。）
- 被动语态：强调动作的承受者（主语是动作的接受者）
例如：An apple is eaten by Tom.（一个苹果被汤姆吃了。）
二、一般现在时被动语态的构成
一般现在时的被动语态由以下结构构成：
> be + 过去分词（V-ed）
其中，“be”根据主语的不同而变化：
| 主语 | be动词 |
|------|--------|
| I / you / we / they | are |
| he / she / it | is |
例句：
- The book is written by a famous author.
- These cars are made in China.
三、被动语态的使用场景
1. 当动作的执行者不重要或未知时
- The window was broken last night.（窗户昨晚被打碎了。）
- （不知道是谁打碎的）
2. 强调动作的承受者
- The cake was baked by my mother.（蛋糕是我妈妈做的。）
- （重点在“蛋糕”）
3. 用于正式或客观的语境
- The experiment was conducted in the lab.（实验是在实验室进行的。）
四、一般现在时被动语态的变化形式
| 句子类型 | 结构 | 例句 |
|----------|------|------|
| 肯定句 | S + be + V-ed | The letter is sent every day. |
| 否定句 | S + am/is/are not + V-ed | The report is not finished yet. |
| 疑问句 | Is/Are + S + V-ed? | Is the work done? |
| 特殊疑问句 | What/Who + is/are + S + V-ed? | Who is the song sung by? |
五、常见错误与注意事项
1. 过去分词的正确形式
- 规则动词：work → worked
- 不规则动词：go → gone, eat → eaten
2. 不要混淆主动语态和被动语态
- 错误：The ball was kickeded by him.
- 正确：The ball was kicked by him.
3. 注意主谓一致
- The book is written.
- The books are written.
六、练习题（附答案）
1. 将下列句子改为被动语态：
a) They sell vegetables in the market.
→ Vegetables are sold in the market.
b) She writes a letter to her friend.
→ A letter is written to her friend.
2. 改写为否定句：
a) The problem is solved.
→ The problem is not solved.
b) The car is driven by him.
→ The car is not driven by him.
3. 改写为疑问句：
a) The flowers are watered every morning.
→ Are the flowers watered every morning?
b) This task is completed by the team.
→ Is this task completed by the team?
七、总结
- 一般现在时被动语态的结构为：be + 过去分词
- 常用于强调动作的承受者或执行者不明确的情况
- 注意动词的过去分词形式和主谓一致问题
- 多加练习，熟练掌握其用法
如需配套PPT课件，请根据以上内容制作幻灯片，包括标题页、知识点讲解、例句展示、练习题与答案等部分。
