文档介绍：Vocabulary & Structure
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被动语态
语态是动词的一种形式，用以说明主语与谓语动词之间的关系。英语的语态共有两种：主动语态和被动语态。主动语态表示主语是动作的执行者，被动语态表示主语是动作的 only wish we could help.
我们但愿能提供帮助。（表愿望）
If there were no gravity, we should not be able to walk.
假若没有引力，我们就不能行走。 （表假想）
He suggests that we should all go to see the film.
他建议我们都去看这个电影。（表建议)
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与现在事实相反
If I were you, I would refuse the money.
假如我是你的话，我就不会要那钱。
与过去事实相反
We would have dropped by if we had had time.
假若我们有时间的话，我们就会顺道拜访。
与将来事实可能相反
If you dropped the glass, it would break.
假如你把玻璃杯掉在地上，它会打碎的。
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虚拟语气的其他用法
用在主语从句，其谓语用should+动词原形（或should+have+过去分词），常用在It is（was)important (suggested,requested...)that...句型中
It is important that we should speak politely.
我们说话要有礼貌，这是很重要的。
用在宾语从句，一种是用作动词wish的宾语从句，另一种是谓语用should+动词原形或只用动词原形的that从句
“must have done” 表示对过去已发生的事进行肯定的推测
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三、宾语从句中的虚拟语气
英语中，如：advise, ask, demand, desire, decide, insist(坚决要求) , order, propose, request, suggest(建议) 表示请求、要求、命令或建议等意义的动词所接的宾语从句一般用虚拟语气，其虚拟语气的结构为：(should) + 原形动词。如：
The teacher advised that we should make good use of every minute here.
老师劝我们要好好地利用在这儿的每一分钟。
The Party asked that we should serve the people with our heart and soul.
党要求我们要全心全意地为人民服务。
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can’t find the key to my office, I ____ have lost it on my way home.
would B. should C. must D. ought to
I _____ that your business was growing so rapidly, I wouldn’t have been worried about it.
Know known known
I hadn’t attended an important meeting yesterday, I _____ to see you.
will have come have come come
D. had come
4. If you had enough money， what ________？
A. will you buy B. would you buy
C. would you have bought D. will you have bought
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5. I didn't see your sister at the meeting. If she _________， she would have met my brother.
has come    B. did come    C. came    D. had come
doctor recommended that Mary (start)_____ the health program