考试常见语法动词语态
语态是动词的一种形式，它用来表示句中主语同谓语动词之间的关系。
英语有两种语态， 主动语态和被动语态， 主动语态表示主语是谓语动词动作的执行者，被动语态表示主语是谓语动词动作的承受者。例如：
I have repaired the radio.
我修好了收音机。
The radio has been repaired.
收音机被修好了。
The students cleaned the classroom.
学生们打扫了教室。
The classroom was cleaned by the students.
教室被学生们打扫了。
被动语态的构成：
be + 过去分词
A building was damaged by the storm.
暴风雨毁坏了一座建筑物。
Our plate was made in China.
我们的盘子是中国生产的。
My bike was stolen.
我的`自行车被盗了。
常用的被动语态的时态变化如下，以 ask 为例：
一般 进行 完成
现在I am asked, I am being asked, I have been asked
过去I was asked,I was being asked,I had been asked
将来I shall be asked, I shall have been asked
过去将来I shall be asked
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