“be动词”的过去式加上动词过去式是一般过去时的被动语态。was/were+动词的过去分词。
主语(动作承受者) + was / were + 过去分词(+ by + 施动者)构成
句型格式：was / were + done
例1、 I was taught by Miss Zhao last year.
去年，我是由赵老师教的。
例2、 Those letters were wirtten by a famous writer.
那些信是由一位有名作家写的。
be动词，意思和用法很多，一般的意思是：是，此种用法，有多种变化形式，is，am，are，was，were，being，been，to be.另外，be动词还有成为的意思。根据句子中不同的人称、数和时间，型态，应该选择相应的be动词。
英语的时态（tense）是一种动词形式，不同的时态用以表示不同的时间与方式。
下面就英语中常见的八种基本时态进行阐述，其它的时态都是在这八种时态的基础上结合而成的。
一、 一般现在时：
1.概念：经常、反复发生的动作或行为及现在的某种状况。
2.时间状语： always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays,
3.基本结构：动词 原形 （如主语为第三人称单数，动词上要加（e）S）
4.否定形式：am/is/are+not;此时态的谓语动词若为行为动词，则在其前加don't,如主语为第三人称单数，则用doesn't，同时还原行为动词。
5.一般疑问句：把be动词放于句首；用助动词do提问，如主语为第三人称单数，则用does，同时，还原行为动词。
6.例句：. It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
二、 一般过去时：
1.概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为。
2.时间状语：ago, yesterday, the day before yesterday, last week(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.
3.基本结构：be动词；行为动词
4.否定形式：was/were+not;在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：was或were放于句首；用助动词do的过去式did 提问，同时还原行为动词。
6.例句：She often came to help us in those days.
I didn't know you were so busy.
三、 现在进行时：
1.概念：表示现阶段或说话时正在进行的动作及行为。
2.时间状语：now, at this time, these days, etc.
3.基本结构：am/is/are+doing
4.否定形式：am/is/are+not+doing.
5.一般疑问句：把be动词放于句首。
6.例句： How are you feeling today?
He is doing well in his lessons.
四、 过去进行时：
1.概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作。
2.时间状语：at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。
3.基本结构：was/were+doing
4.否定形式：was/were + not + doing.
5.一般疑问句：把was或were放于句首。
6.例句：At that time she was working in a PLA unit.
When he came in, I was reading a newspaper.
五、 现在完成时：
1.概念：过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。
2.时间状语：recently, lately, since…for…,in the past few years, etc.
3.基本结构：have/has + done
4.否定形式：have/has + not +d one.
5.一般疑问句：have或has。
6.例句：I've written an article.
It has been raining these days.
六、 过去完成时：
1.概念：以过去某个时间为标准，在此以前发生的动作或行为，或在过去某动作之前完成的行为，即“过去的过去”。
2.时间状语：before, by the end of last year(term, month…),etc.
3.基本结构：had + done.
4.否定形式：had + not + done.
5.一般疑问句：had放于句首。
6.例句：As soon as we got to the station, the train had left.
By the end of last month. We had reviewed four books
七、 一般将来时：
1.概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事。
2.时间状语：tomorrow, next day(week, month, year…),soon, in a few minutes, by…,the day after tomorrow, etc.
3.基本结构：am/is/are/going to + do；will/shall + do.
4.否定形式：was/were + not; 在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：be放于句首；will/shall提到句首。
6.例句：They are going to have a competition with us in studies.
It is going to rain.
八、 过去将来时：
1.概念：立足于过去某一时刻，从过去看将来，常用于宾语从句中。
2.时间状语：the next day(morning, year…),the following month(week…),etc.
3.基本结构：was/were/going to + do；would/should + do.
4.否定形式：was/were/not + going to + do;would/should + not + do.
5.一般疑问句：was或were放于句首；would/should 提到句首。
6.例句：He said he would go to Beijing the next day.
I asked who was going there .
主动语态表示主语是动作的执行者,被动语态表示主语是动作的承受者.首先要看主语，如果主语是物，再看动词，如果动作是物发出的，那它就用主动语态了。
如果主语是物，而动作是人发出的，那就用被动语态了。
如：
Many people speak English．（主动语态）
English is spoken by many people．（被动语态）
1．被动语态的构成
由于不及物动词不能带宾语,故无被动语态,只有及物动词或相当于及物动词的动词短语才有被动语态,其基本构成方式是“助动词be＋过去分词”.
注意：“be＋过去分词”结构不一定都是被动语态,有些动词（如 be,feel,look,seem等）后面的过去分词已转化为形容词,用作表语表示状态.如：
My bike is broken．（我的自行车坏了.）
The door is open．（门开了.）
2．主动语态改被动语态的方法
1）将主动语态改为被动语态应注意以下三个方面：①将主动语态的宾语改为被动语态的主语；②将主动语态的谓语动词改为“be＋过去分词”结构；③将主动语态的主语改为介词by之后的宾语,放在谓语动词之后（有时可省略）.
2）含直接宾语和间接宾语的主动语态改为被动语态时有两种情况：①把间接宾语改为被动语态的主语,直接宾语仍保留原位；②把直接宾语改为主动语态的主语,此时,间接宾语前要加介词to或 for.如：
He gave the boy an apple．→The boy was given an apple．（或An apple was given to the boy．）
Her father bought her a present．→She was bought a present by her father．（或A present was bought for her by her father．）
3）不带to的动词不定式作宾语补足语的主动语态,改为被动语态时不定式前要加to.如：
They watched the children sing that morning．→The children were watched to sing that morning．
4）带复合宾语的动词在改为被动语态时,一般把主动语态的宾语改为主语,宾语补足语在被动语态中作主语补足语.如：
We call him Xiao Wang．→He is called Xiao Wang．
He cut his hair short．→His hair was cut short．
They told him to help me．→He was told to help me．
5）短语动词是不可分割的整体,改为被动语态时要保持其完整性,介词或副词不可遗漏.如：
We must take good care of the young trees．→The young trees must be taken good care of．
6）含有宾语从句的主动结构变为被动结构时,通常用it作为被动结构的先行主语,从句放在句子后面；也可采用另一种形式.可以这样转换为被动结构的动词有know,say,believe,find,think,report等.如：
People believe that he is ill．→It is believed that he is ill．（或：He is believed to be ill．）