被动语态在使用时都需要注意哪些问题？(英语被动语态的注意事项)
英语被动语态的注意事项
1.不及物动词无被动语态。
The dinosaurs disappeared about 65 million years ago.
2.有些动词用主动形式表示被动意义。这些动词主语以物居多，谓语动词一般表示主语的性质和特征。这类动词有许多，如: write, break, selld等。
This pen writes well.
This new book sells well.
3.感官动词或使役动词使用省略to的动词不定式，主动语态中不带to ，但变为被动语态时，须加上to 。 感官动词有smell,sound,taste,fell等。使役动词有let,make,have,help,hear,see,watch,notise,look,listen.
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.
His mother gave him a present for his birthday.→ He was given a present by his mother for his birthday.
4.如果是接双宾语的动词改为被动语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词是由与其搭配的动词决定。
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动语态时，动词短语应当看作一个整体，而不能丢掉其中的介词或副词。
We can't laugh at him. →He can’t be laughed at 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.
6.一些表示状态的动词没有被动语态。如：have, belong to等。
1.动词短语变成被动语态时要注意什么? 2.哪些动词不能用于被动语态？ 3.哪些单词和词组不能用于被动语态
a. 系动词不用被动
b. have（无论当“有”讲，还是当其他动词讲，都不用被动）
c. 表示状态的equal, fit, hold（容纳）join（参加），mean（意味着），last（持续），cost（花费），wish（希望），belong to（属于）等。
d. 当及物动词leave, enter, reach等的宾语，表示地点、处所或组织的名词时，不用被动语态。
e. 当动词和宾语已组成一个不可分割的成语时，不用被动语态，如keep one’s word, make up one’s mind, speak one’s mind, do one’s best, lose heart, keep watch, make a face等
f. 动词let一般不用被动式，看需用，可改为allow等意思相同的动词。
如何正确地应用被动语态呢？
需要根据句子的时态和人称来决定。
are和were用于复数人称，was和is用于第三人称单数。
时态对应如下：
一般现在时
①am;is;are②do/does(V.;V.s)
am;is;are+done(V. p.p)
一般将来时
will;be going to;be (about)to+do(V.)
will+be+done(V. p.p)
一般过去时
①was;were②did(V.-ed)
was;were+done(V. p.p)
现在进行时
am;is;are+doing(V.-ing)
am;is;are+being+done(V. p.p)
过去进行时
was;were+doing(V.-ing)
was;were+being+done(V.p.p)
现在完成时
have;has+done(V. p.p.)
have;has+been+done(V. p.p)
过去完成时
had+done(V. p.p.)
had+been+done(V. p.p.)
情态动词
情态动词+V.
情态动词+be+done(V. p.p.)
过去将来时 would/should +V. would/should be + done(V. p.p.)
请问被动语态在什么情况下要用？
语态是动词的一种形式，用来说明主语和谓语之间的关系。英语有两种语态，即主动语态和被动语态。主动语态就是比较正常的语态，主语是动作的执行者、发出者。而被动语态当然是在要表示被动的情况下使用的，主语是动作的承受着。
被动语态一般都翻译为： sb./sth.被sb./sth.……
例：1.主动语态：we call him Bruce.我们叫他布鲁斯。
被动语态：He is called Bruce by us.他被我们称为布鲁斯。
2.主动：My sister made this model ship.我姐姐做了这条模型船。
被动：This model ship was made by my sister.这条模型船是被我姐姐做出来的。
被动语态主要在以下三种情况下使用：
1）当不知道动作的执行者时
例：Tea was introduced into Europe from China.茶是由中国传到欧洲的。
2）当没有必要指出动作的执行者是谁时
例：Chinese is spoken in China.（我想这句就不用翻译了吧……）
3)当需要强调动作的承受者时
例：This model ship was made by my sister.这条模型船是被我姐姐做出来的。
例句：
被动：Computer was invented in 1976.计算机是在1976年发明出来的。
被动：Knives are used for cutting things.倒是被用来切东西的。
被动：Caculator was invented by him.计算机是被他发明的出来的。
被动：These books aren't allowed to be taken out of libarary.这些书是不准备带出图书馆的。
被动：The boy was seen to swim in the river yesterday.这个男孩昨天被看到在河里游泳。
总之，你在翻译被动句时，若怕不保险，就统一在句子里加一个“被”字就行了，就像上面我给你翻译的一样，你就当他是一般句子来翻译，只要在主语的后面加一个“被”字就行，不管句子翻译的是否流畅，但肯定不会出错