1. If he were free, he would help us. 要是他有空的话，它会协助我们的。
2. If I had en the film, I would have told you about it. 我假设看过这场电影，我会把电影内容告诉你了。
3. If I had got there earlier, I would have met Mr. Li. 假设我早点到那儿，我就会会到了李先生。
4. If you should miss the chance, you would feel sorry for it. 假设你错过了这次机会，你会难过的。expect的用法
5. If I knew German，I would read the paper to you.我要是懂德语，我就会给你读这篇文章。
6. If he were here，we could ask him．假设他在这里，我们会问他的。
7. If I were you, I would accept his offer.我要是你，就接受他的协助。
8. If I were a bird, I would fly to you. 假设我是一只鸟，我会飞到你身边。
9. If it were to rain(=Should it rain=Rained) tomorrow, we would not go for a picnic.
假设明天下雨的话，我们就不去野炊了。
10. If it were to rain tomorrow, the football match would be put off.
11. If he had taken my advice, he would have succeeded in the competition.
12. If you had come a few minutes earlier, you would have met him.
假设你早来几分钟，你就会碰上他。
注：特别说明恪尽职守
1、l would/should/could/might主句谓语中的满足的英文should英语必修5课文录音主要用于第一人称后;would表示结果还表示过去经常常常做某事，might表示可能性，could表示水平、允许或可能性。比较：
If you tried again ，you would succeed. 要是你再试一试，你就会成功的。 (would表结果)
If you tried again， you might succeed. 要是你再试一试，你可能会成功的。 (might表可能)
If you tried again ，you could succeed. 要是你再试一试，你就能成功了。(could表水平)
2、错综时间虚拟条件句 即条件从句与主句所指时间不一致，如从句指过去，而主句即指的是现在或将来，此时应根据具体的语境情况，结合上面提到的三种基本类型对时态作相对应的调整：
If it had rained last night, the ground would be wet now. 要是昨晚下过雨的话，现在地面就会是湿的。
You would be much better now if you had taken my advice. 假若你当时听我的话，你现在就会好多了。
3、If虚拟条件句的否认(含蓄条件句) 常考两个句型：If it weren't for…和If it hadn't been for…，其意为"若不是(有)" "要不是"。如：
If it weren't for water, no plant could grow. 要是没有水植物就无法生长。
If it hadn't been for your assistance ，we wouldn't have succeeded.
=But for your assistance ，we wouldn't have succeeded.
=Without your assistance ，we wouldn't have succeeded.假设没有你的协助，我们不会成功的。
4、If虚拟条件句的倒装形式，即把were, had, should置于句首。例：
Were I in school again (= If I were in school again), I would work harder.假设我能再上一次学，我会学习得更努力。
Had you asked me, I would have told you. (=If you had asked me,…)假设你问我，我会告诉你。
编辑本段第二类
使用虚拟语气的常见结构或从句：
1.*wish与hope接宾语从句的区别在于：hope表示一般能够实现的希望，宾语从句用陈述语气。wish表示很难或不大可能实现的希望,宾语从句用虚拟语气。试比较：
(1) We hope they will come. (We don't know if they can come.)
(2) We wish they could come. (We know they are not coming.)我们希望他们能来。
2.if only 与 I wish一样，也用于表示与事实相反的愿望，其后所虚拟语气的时态与 wish后所接时态的情况相同：
If only she had had more courage! 她再勇敢一些就好了。
If only I had listened to my parents! 我要是当时听了父母的话就好了。
If only she would go with me! 她要是愿意和我一道去就好了!
*if only 通常独立使用，没有主句。
3.l would rather后句子用虚拟语气 只分现在和过去
在would rather, would sooner, would just as soon后的that从句中, 句子谓语习惯上要用虚拟语气， 表示"宁愿做什么" ，具体用法为：
① 一般过去时表示现在或将来的愿望
I'd rather you went tomorrow (now). 我宁愿你明天(现在)去。
② 用过去完成时表过去的愿望
I'd rather you hadn't said it. 我真希望你没有这样说过。
4.l as if (though)从句用虚拟语气
以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气,则与wish用法相同，例：
He acts as if he knew me. 他显得理解我似的。
They treat me as though I were a stranger. 他们待我如陌生人。
He talks as if he had been abroad. 他说起话来好像以前出过国。
注：两点说明
(1) 从句所表示的内容若为事实或可能为事实，也可用陈述语气：
It looks as if we'll be late. 我们似乎要迟到了。
(2) 注意 It isn't as if…的翻译：
It isn't as if he were poor. 他不像穷的样子(或他又不穷)。
编辑本段第三类
从句中should+动词原形，should可省略
1. 在 lest ，for fear that( 以免) ,in ca(以防)引导的目的状语从句中的虚拟语气
She walked quietly lest she (should)wake up her roommates. 她走得很轻以免吵醒她的室友。
2. 表理应做 值得做 一类动词后的宾语从句
建议advi, suggest, propo, recommend命令order, command
请求ask, demand, require, request指示direct
督促urge提议move, vote
希望desire坚持tomorrow是什么意思insist
打算intend安排arrange
例如：
I insisted that he (should)stay. 我坚持要他留下。
He urged that they go to Europe. 他督促他们到欧洲去。
He suggested that we shouldstrengtheningleave early. 他建议我们早点动身。
He ordered that it (should)be nt back. 他命令把它送回去。
I ask that he leave. 我要求他走开。
父亲节英语He requires that I (should)appear. 他要求我出场。grade
I move that we accept the proposal. 我提议通过这项提案。
He arranged that I should go abroad. 他安排我去国外。
友谊地久天长英文
She desires that he do it. 她希望他做此事。
The general directed that the prisoners should be t free. 将军指示释放那些俘虏。
*suggest表"暗示"insist表"坚持说"时不用虚拟语气
比较:
He insisted that Ihad read his letter. 他坚持说我看过他的信。
He insisted that I should read his letter. 他坚持要我看他的信。
He suggested that we (should) stay 托福培训班for dinner. 他建议我们留下吃饭。
I suggested that you had a cret understanding with him. 我觉得你与他心照不宣。
3. order,suggestion,idea,plan, proposal, advice, demand等名词后的表语从句或同位语从句
Our suggestion is that you( should)be the first to go. 我们的建议是你应该第一个去。
