?比较简单的被动语态讲解：
自动语态改被迫语态的办法
1)将自动语态改为被迫语态应留意以下三个方面：
①将自动语态的宾语改为被迫语态的主语;
②将自动语态的谓语动词改为“be+过去分词”构造;
③将自动语态的主语改为介词by以后的宾语，放在谓语动词以后(有时可省掉)。
2)含直接宾语和直接宾语的自动语态改为被迫语态时有两种状况：
①把直接宾语改为被迫语态的主语，直接宾语仍保存原位;
②把直接宾语改为自动语态的主语，此刻，直接宾语前要加介词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自动语态，改为被迫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迫语态时，通常把自动语态的宾语改为主语，宾语补足语在被迫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)短语动词是不行分割的全体，改为被迫语态时要坚持其完整性，介词或副词不行遗失。如： We must take good care of the young trees.→The young trees must be taken good care of.
6)富含宾语从句的自动构造变为被迫构造时，通常用it作为被迫构造的先行主语，从句放在语句后边;也可采用另一种方式。能够这么转换为被迫构造的动词有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.)
1. 通常现在时的被迫语态构成：is / am / are + 及物动词的过去分词
Our classroom is cleaned everyday.
I am asked to study hard.
Knives are used for cutting things.
2. 通常过去时的被迫语态构成：was / were + 及物动词的过去分词
A new shop was built last year.
Dinosaur eggs were laid long long ago.
3. 现在完成时的被迫语态构成：has / have + been + 及物动词的过去分词
This book has been translated into many languages.
Many man-made satellites have been sent up into space by many countries.
4. 通常将来时的被迫语态构成：will+ be + 及物动词的过去分词
A new hospital will be built in our city.
Many more trees will be planted next year.
5. 富含神态动词的被迫语态构成：神态动词+ be + 及物动词的过去分词
Young trees must be watered often.
Your mistakes should be corrected right now.
The door may be locked inside.
Your homework can be handed in tomorrow.
6. 现在进行时的被迫语态构成：am / is / are + being + 及物动词的过去分词
Uncle Wang is mending my bike now.→
My bike is being repaired by Tom now.
They are planting trees over there. →
Trees are being planted over there by them.
7. 不定式的被迫语态：to + be + 及物动词的过去分词
There are two books to be read. →
There are twenty more trees to be planted.
三、 运用被迫语态应留意的几个问题：
1. 不及物动词无被迫语态。
What will happen in 100 years.
The dinosaurs disappeared about 65 million years ago.
2. 有些动词用自动方式表明被迫含义。
This pen writes well.
This new book sells well.
3. 感官动词或使役动词运用省掉to的动词不定式，自动语态中不带to ，但变为被迫语态时，须加上to 。
例：make somebody do something→somebody+ be +made to do something
see somebody do something→somebody +be +seen to do something
A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.
The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
4. 如果是接双宾语的动词改为被迫语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词是由与其调配的动词决议。
He gave me a book.→A book was given to me by him.
He showed me a ticket.→A ticket was shown to me by him.
My father bought me a new bike. →A new bike was bought for me by my father.
5. 一些动词短语用于被迫语态时，动词短语应当看作一个全体，而不能扔掉其间的介词或副词。
We can’t laugh him. →He can’t be laugh by us.
He listens to the radio every day. →The radio is listened to by him every day.
The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse.
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