4、would与 used to 的区别 .would 可表示反复发生的动作或某种倾向。used to表示过去的习惯动作或状态，强调现在已不存在。例如：
She used to work into the night. 过去她常工作到深夜。(现在不了)
She would work into the might. 以前她常工作到深夜。(不表示现在不了)
People used to think that the sun went round the earth. 以前人们总认为太阳是围绕地球转的。(现在不这样认为了)
I used to smoke quite a lot, but I have given it up. 我过去抽烟很凶，现在戒了。
情态动词的重点和难点是：情态动词之间的区别;表示“推测”的表达方式;以及“情态动词+have+过去分词”的含义。
五、被动语态
(一)简介 来源:考试大网
在英语中，语态是动词的一种形式，表示主语和谓语的关系。英语动词有两种语态，即主动语态和被动语态。主动语态(active voice) 表示主语是动作的执行者;被动语态(passive voice)表示主语是动作的承受者。如：
Saddam is being tried. 萨达姆正在接受审判。
The Iraqi government is trying Saddam. 伊拉克政府正在审判萨达姆。
More and more people use computers now.(主动语态)
Computers are more and more widely used now.(被动语态)
English is spoken all over the world. (被动语态)
(二)英汉两种语言在表达被动方式上的差异
汉语表达被动语态非常简单明了，用“被”“遭”“受”等词来表示，如“被捕”、“被杀”、“受到凌辱”等。而英语表达被动的方式也不复杂，用“助动词be+动词的过去分词”表示。其中助动词be有人称、数量和时态的变化，而这正是英语被动语态的难点。
(三)被动语态的构成
被动语态由“be+及物动词的过去分词”构成。这里要强调一定是及物动词的过去分词，因为不及物动词不能带宾语，也就不可能有被动语态。英语主动语态有16个时态;被动语态常用的有8个，以give为例说明如下：
|
时态 |
动词形式 |
|
一般现在时 |
Am/is/are given |
|
一般过去时 |
Was/were given |
|
一般将来时 |
Shall/will be given |
|
现在进行时 |
Am/is/are being given |
|
过去进行时 |
Was/were being given |
|
过去将来时 |
Should/would be given |
|
现在完成时 |
Has/have been given |
|
过去完成时 |
Had been given |
被动语态的疑问句是将第一个助动词移到主语之前、句末用问号;否定式是在第一个助动词后加not或never等其他否定词、句末用句号。如：
“During the interview, were you asked questions in English?” “No, I wasn’t asked questions in English.” “面试的时候，用英语问你问题了吗?”“没有，没有用英语问我问题。”
The origin of the universe will probably never be explained. 宇宙的起源大概永远也不会被解释清楚。
Is the restaurant being decorated? 那家餐馆正在装修吗?
The restaurant is not being decorated. In the fact the restaurant has never been decorated。 那家餐馆没有在装修。实际上，那家餐馆从来没有装修过。
(四)被动语态的用法 来源：考试大
1、不知道或没有必要指出动作的执行者。换个说法，有一件事情不知道是谁干的或者不想说出是谁干的，这时就用被动语态。例如：
I felt a littlie nervous when I was being interviewed. 我接受面试的时候，有点紧张。
These fighters are imported from Russia. 这些战斗机是从俄国进口的。
That place has been turned into a swimming pool. 那个地方已被变成游泳池。
2、说话或发表意见时，为了显得客观公正，也常用被动语态
He’s said/believed/reported to be in the U. S. A. 据说/据信/据报道他在美国。
还有下列常用句型(that后面跟句子)：
It is said that……. 据说
It is reported that……. 据报道
It is hoped that……. 希望
It is believed that……. 人们相信
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