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请问 怎样将一个句子改成被动语态!有哪些方法

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请问 怎样将一个句子改成被动语态!有哪些方法
请问 怎样将一个句子改成被动语态!有哪些方法
最基本:谓语变主语,用Be 被动语态
Many people speak Chinese.   谓语:speak的动作是由主语many people来执行的.   
变被动Chinese is spoken by many people. 中文Chinese是动词speak的承受者.
be+过去分词+by+动作执行者
参考:
1. 一般现在时的被动语态构成: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. 一般过去时的被动语态构成: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. 现在完成时的被动语态构成: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. 一般将来时的被动语态构成: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. 含有情态动词的被动语态构成:情态动词+ 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. 现在进行时的被动语态构成: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. 不定式的被动语态: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.   
8.过去将来时的被动语态:would + be + 及物动词的过去分词   
He said he would finish the work soon.   He said the work would be finished soon by him.
把主动语态改为被动语态非常简单,可以遵循以下几个步骤:   
1. 先找出谓语动词;   
2. 再找出谓语动词后的宾语;   
3. 把宾语用作被动语态中的主语;   
4. 注意人称、时态和数的变化.   
例:1. Bruce writes a letter every week. →A letter is written by Bruce every week.   
2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning.   
3. He has written two novels so far.→Two novels have been written by him so far.   
4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.   
5. Lucy is writing a letter now.→A letter is being written by Lucy now.   
6. You must lock the door when you leave.→the door must be locked when you leave.