3.带有双宾语的主动句变被动句时, 将直接宾语或间接宾语变成被动句的主语都可

　　　　 a. My brother gave me a birthday present.

　　　　 →I was given a birthday present. / A birthday present was given to me.

2.带有宾语从句的主动句变被动句时, 宾语从句变成主语从句, 通常不位于句首, 句首用形式主语it

　　　　 a. We can learn from the text that delicious apples are big.

　　　　 →It can be learned from the text that delicious apples are big.

1.主动句中的宾语转换成被动句的主语, 时态不变

　　　　 a. The manager gave me ten minutes to decide whether I should accept the offer.

　　　　 →I was given ten minutes to decide whether I should accept the offer.

3.强调或突出动作的承受者时, 用被动语态

　　　　 a. The plan has already been made.

　　　　 b. Yao Ming was elected MVP of the last week.

2.没有必要或不想指出谁是动作的执行者时, 用被动语态

　　　　 a. China was liberated in 1949.

　　　　 b. I was told you were late this morning.

1.不知道谁是动作的执行者时, 用被动语态

　　　　 a. His bike has been stolen.

　　　　 b. This window was broken last night.

特别说明: 将来进行时和各种完成进行时态没有被动语态形式

带有情态动词的被动语态的构成: 情态动词 + be +过去分词

　　　　 a. The work must be done right now.

　　　　 b. That prisoner may be sentenced to death.

2.用法: 过去将来时表示相对过去某一时刻来说将要发生的动作或呈现的状态, 以上各形式的具体用法与一般将来时各形式的用法相似

被动语态

1.构成:

①.should / would do

　　　　 a. He said he would go to Shanghai for the holiday.

　　　　 b. He told me that I should succeed.

②.was / were going to do

　　　　 a. They were going to have a meeting.

　　　　 b. The students were going to plant some trees around the playground.

③.was / were (about) to do

　　　　 a. We were to finish the work in three days.

　　　　 b. I was about to go out when a friend dropped in.

2.用法: 表示在将来的某一时刻之前将要完成的动作, 这一动作也可能继续进行

　　　　 a. By seven o’clock this afternoon we shall have arrived in Shanghai if the train keeps good line.

　　　　 b. Before noon we will have completed this work.