动词的语态[Active & Passive Voices]
用来表示句子的主语和动词之间的关系的动词形式称为语态。英语动词的语态有两种：主动语态和被动语态。主动语态表明句子的主语是动词动作的执行者；被动语态表明句子的主语是动词动作的承受者。
1. Our class room must ____ every day.
A. clean B. cleaned
C. be cleaned
解析：C. 主语classroom与动词clean之间存在着被动关系，要用被动语态形式。
2. That new TV set ____ in Taiwan.
A. made B. are made
C. makes D. is made
解析：D. be made in意为“在哪里制造”，主语是单数，动词用单数形式。
3. Football ____ all over the world.
A. is playing B. play
C. plays D. is played
解析：D. football与play之间是被动关系，应该用动词被动式。all over the world意为“全世界”。
4. We know that this kind of bike ____ in Taiwan.
A. is made B. mades
C. is madding
解析：A. 从句中的主语this kind of bike表示“这种自行车”，它与动词之间是被动关系。
5. That house ____ in 1990. We have lived there for nearly ten years.
A. built B. builds
C. is built D. was built
解析：D. 句中的时间副词是过去时间，因此用一般过去时的被动语态。
6. With the villagers" ____ the young trees have been ____.
A. land; watered B. money; taken good care
C. help; well looked after D. fields; planted
解析：C. with one"s help意为“在某人的帮助下”，tree与look after有被动关系。
7. The river smells terrible. People must ____ dirty things into it.
A. be stopped to throw B. be stopped from throwing
C. stop to throw D. stop from throwing
解析：B. stop sb. from doing sth.意为“阻止某人做某事”。在本句中sb.(people)成了句子的主语，它与stop之间由主动关系转化为被动关系。
8. This kind of flower ____ every day.
A. must water B. must be watered
C. water D. will water
解析：B. 情态动词的被动语态构成是：情态动词+be+动词的过去分词。
9. Rice must ____ at the right time.
A. be harvested B. harvest
C. be harvesting D. be harvest
解析：A. 考查含有情态动词的被动结构。rice与harvest“收割”是被动关系。
10. －Do you like the flower? －Yes, it ____ sweet.
A. is smelling B. smelt
C. is smelt D. smells
解析：D. smell是系动词，后跟形容词，意为“闻起来”，不用被动语态，类似的系动词还有look, sound, taste, seem等。
11. The medicine ____ cool, clean and dry.
A. must keep B. must be kept
C. must be carried D. must be in
解析：B. 考查含有情态动词的被动结构。动词keep表示“保存、使……保存在某一状态”
12. That white building ____ two years ago, but it looks quite old now.
A. built B. was built
C. is built D. builds
解析：B. 查一般过去时的被动语态。句中有过去时间副词，所以应该用一般过去时的被动语态。
13. The lost boy ____ this morning.
A. found B. was founded
C. was found D. had found
解析：C. find的过去分词是found全句意为：“走失的男孩今天早晨被发现了”。
14. Many new houses ____ for teachers since last year.
A. are building B. built
C. have built D. have been built
解析：D. 由于句子中有since引导的时间副词，动词应用现在完成时；本句中的house与build存在着被动关系，因此应用现在完成时的被动语态。
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