在英语学习中，掌握被动语态是非常重要的。它可以帮助我们更准确地表达动作的接受者，而不是强调动作的执行者。为了帮助大家更好地理解和运用被动语态，下面是一些精选的练习题。
练习题一：改写句子
将以下主动语态的句子改写为被动语态：
1. Someone cleans the classroom every day.
- The classroom is cleaned every day.
2. They will build a new library next year.
- A new library will be built next year.
3. The teacher explained the rule to us.
- The rule was explained to us by the teacher.
4. People speak English all over the world.
- English is spoken all over the world.
5. We will finish the project before Friday.
- The project will be finished before Friday.
练习题二：选择正确的被动语态
根据上下文，选择正确的被动语态形式填空：
1. The book ________ (write) by Mark Twain is very popular.
a) writes
b) written
c) is written
正确答案：b) written
2. A new bridge ________ (build) across the river last year.
a) builds
b) built
c) was built
正确答案：c) was built
3. The letter ________ (send) yesterday has not arrived yet.
a) sent
b) sending
c) is sent
正确答案：a) sent
练习题三：判断正误
判断下列句子是否正确使用了被动语态，并说明原因：
1. The cake is being eaten by my sister.
- 正确。句子使用了现在进行时的被动语态。
2. The window broke.
- 错误。句子中没有明确的动作执行者，因此不是被动语态。
3. This song is sung by many people.
- 正确。句子使用了一般现在时的被动语态。
通过这些练习题，我们可以更好地理解被动语态的结构和用法。希望这些题目能够帮助大家提高英语水平。记住，多做练习是掌握语法的关键！
