被动态的助动词通常是be的相应形式，但有时get也像be一样起助动词的作用，只要用于一般现在时、一般过去时、一般将来时和现在完成体。常见于不规范的语体中，动作的主动者不需要表达。
The boy was hurt by a ball.
The boy got hurt on his way home from work.
这种结构往往用来强调动作的结果而非动作本身，也不是所有的-ed分词都可与get一起构成被动态，常见的有：hurt, lose, dress, marry, accustom, confuse, finish, drink, invite, bore, pack, pay, hire, fire, disgust, engage, divorce, remarry等。
常用于此类结构的动词短语：account for, agree upon, arrive at, attend to, call for, call on, count upon, depend/rely on, dispose of, dream of, fire at, go about, hear of, improve upon, insist on, interfere with, laugh at, listen to, look after, look at, look up, operate on, provide for, run over, send for, speak of, talk about, wait on等。
The baby was well looked after.
常用于此类结构的动词短语：call off, close down, hand in, hand over, pass on, pull down, put across, put aside, put down, put forward, put off, put on, set up, take off, talk over, think over, turn down, turn in, turn on, turn into, turn out。
The meeting has been put off till next week.
常用于此类结构的动词短语：break in on, check up on, do away with, look down upon。
The accident was checked up on yesterday.
以上三类动词短语转换为被动态时，后面的介词或副词不能拆开或省略。
大多数及物动词都能用被动语态，但某些主要是表示状态的动词如fit, have（有）,lack, owe, own, possess, resemble, suit, let等不能构成被动语态。
I have a nice house.
一般情况下不说：
❌A nice house is had.
例1.His life was spent in Hong Kong.
例2.The rest of his life was spent in the Unitied States.
解析
上两例中的spent不能用lived代替。尽管live在作“度过”讲时，是及物动词，但它带的是与之同源的名词life作宾语，语法上成为同源宾语。同源宾语即动词与其宾语属于同一词源者。就是说，同源宾语结构不可用于被动态。另外还有dream a dream，breathe a breath，smile a smile， die a death等。
You should dress yourself more neatly. 你自己应该穿得整齐一点。
yourself是一个反身代词，反身代词在句中作宾语，不能变为被动。
He shook his head. 他摇头。
当物主代词加上宾语构成主语身体一部分时，就不能变成被动语态。例句中his head是主语身体的一部分，因此不能用被动态。
He wants to read the book. 他要看书。
宾语为动词不定式时，一般不能变成被动。因此，例句中to read the book不能成为被动句中的主语。
有一种主动句可以转换为两种形式的被动语态：
People said that he was jealous of her.
a. It was said that he was jealous of her.
b. He was said to be jealous of her.
a、b句中，b句的转换较为复杂。它的不定式的动词形式要依照原that从句中的不同时、体做相应的变化。若that从句谓语动词为现在进行体或将来进行体，那么不定式便用进行体形式；一般现在时，不定式结构用一般形式；过去时或现在完成体，不定式使用完成体形式；过去进行时，不定式用完成进行体形式。
1. It is reported that he was driving carelessly. → He is reported to have been driving carelessly.
2. It is believed that he arrived/has arrived. → He is believed to have arrived.
3. It is thought that he drives badly. → He is thought to drive badly.
具有上述两种被动语句转换形式的动词还有acknowledge, assume, claim, consider, estimate, fear, feel, find, know, presume, report, understand等
注：体是指动词所表示的动作在某一时间内的进程或状态，有进行体、完成体和完成进行体。
