九牛一毛是什么意思
8种常用时态的被动语态
由“助动词be + 动词的过去分词”构成。助动词be 有时态、人称和数的变化。
(1) 一般现在时：am/is/are +过去分词。如：
Rice is grown in south China. 华南种植水稻。
(2) 一般过去时：was/were+过去分词。如：
The glass was broken yesterday. 这块玻璃是昨天打烂的。
(3) 现在进行时：am/is/are being +过去分词。如：
The project is being carried out. 这个计划正在执行中。
(4) 过去进行时郑光祖：was/were/being +过去分词。如：
This road was being built this time last year. 这条路去年这个时候还在修建。
(5) 一般将来时：will be +过去分词。如：
The cars will be nt abroad by a. 这些汽车将由水路运往国外。
(6) 过去将来时：would be +过去分词。如：
The manager said the project would be completed by the end of the year. 经理说这个工程在年底前将会完成。
(7) 现在完成时：have/has been +过去分词。如：
This novel has been translated into veral languages. 这本小说已被译成了几种语言。
(8) 过去完在时：had been +过去分词。如：
When I got to the theatre, I found the tickets had already been sold out. 我到达剧院时，发现票已卖完了。
被动语态的主要用法
酉乍怎么读
■当不知道或没有必要指出动作的执行者时，常用被动语态，这时往往不用by短语。
The front window in the classroom was broken yesterday. 昨天，教室的前窗被打破了。(不知谁打破的)
They have been poorly paid. 他们的工资太低。(没必要指出工资是谁付的)
■突出或强调动作的承受者，如果需要说出动作的执行者，用by短语。
The time-table has been changed. 时间表已变动了。(要突出的是“时间”)
The books are written especially for children. 这些书是专门为孩子们写的。(强调的是“”这些书)
■为了使语言得体或圆滑等不愿意说出动作的执行者。如：
You are requested to make a speech at next meeting. 请您在下次会议上作个发言。
It is said that she is going to be married to a foreigner. 据说她要嫁给一个外国人。
■出于修辞的原因，或是说为了更好地安排句子。如：
It is generally considered impolite to ask one’s age, salary, marriage, etc. . 问别人的年龄、工资、婚姻状况等通常被认为是不礼貌的。
The notion is especially oppod to by tho who have invested much in the area. 这个提议特别遭到了那些在本地区投资很大的人的反对。(因tho的定语太长了，若用它作主语，主语与谓语就相距太远而显得句子松散。)
主动语态变被动语态的方法
1. 基本方法
将主动语态的宾语变为被动语态的主语，将主动谓语变为被动谓语(be+过去分词)，将主动语态的主语变为by短语(在被动句中用作状语)：
He stole our money.→Our money was stolen by him.
【注】(1)若不强调动词执行者，被动语态中的by短语通常可以省略：
The hou was built in 1978. 这座房子是1978年建的。
(2) 在转变语态时，要注意保持两种语态时态的一致性：
The students will study the problem.
→The problem will be studied by the students.
A friend of ours is repairing the roof.
→The roof is being repaired by a friend of ours.
2. 双宾动词的被动语态
双宾动词即指带双宾语的动词，它们在变为被动语态时，有以下两种情形值得注意：
(1) 有些双宾动词(如award, buy, give, leave, lend, offer, pay, show, teach, tell等)在变为被动语态时，既可把间接宾语(指人)变为被动语态的主语，而把直接宾语(指事物)保留下来樊读音(称为保留宾语)，也可把直接宾语(指事物)变为被动语态的主语，而把间接宾语改为介词to 或for引起的状语(到底用to还是for，与所搭配的动词有关)。比较：
He gave her some money. 他给她一些钱。
→ She was given some money. / Some money was given to him.
He bought her a watch. 他给她买了一快表。
网站管理员→ A watch was bought for her. / She was bought a watch.
(2) 有些双宾动词(如bring, do, make, pass, ll, nd, sing, write等)通常用直接宾语(指事物)租赁合同作被动语态的主语，而将间接宾语用作保留宾语(其前根据情况用介词to或for)：
Father made me a doll. → A doll was made for me.
He wrote her a letter. → A letter was written to her.
(3) 有些双宾动词(如answer, deny, envy, refu, save, spare等)通常用间接宾语(指人)作被动语态的主语，而将直接宾语用作保留宾语：
He answered me that question. → I was answered that question by him.
3. 含有情态动词的被动形式
若主动语态中谓语含有情态动词，在相应的被动语态中通常应保留该情态动词，其结构为“情态动词+be(或be的适当时态形式)+过去分词”：
Everyone must know this. →This must be known by everyone.
请看以下带情态动词被动句实例：
This can’t be done in a short time. 这不是短期内可以完成的。
新生儿大便带血She may have been nt to work elwhere. 她可能被派到别处工作去了。
The door must have been locked by my wife. 门一定是我妻子锁的。
The environment should be improved. 环境应当改善。
The cond point needn’t be discusd today. 高楼外墙清洗第二点今天不必讨论。
