if虚拟语气经典句子 if引导的虚拟语气
1、如果句子在想象现在发生而实际未发生的事件，由现在时倒退成过去时：
（从句）if+过去时，（主句）4个情态动词+动词原形
2、如果句子在想象将来发生而实际不会发生的事件，由将来时倒退成过去时，所以与1是一样的，但是此处从句有三种：
（从句）if+过去时/if+were to do/if+should do，（主句）4个情态动词+动词原形
3、如果句子在想象过去发生而实际没有发生的事件，有过去时倒退成过去完成时：
（从句）if+过去完成时，（主句）4个情态动词+have done
扩展资料发音：英 [ɪf] ；美 [ɪf]
释义
1、conj. （表条件）如果；即使；是否；（表假设）假如
①(表示条件)如果
②(表示虚拟)假如,要是
③(表示让步)即使
④是否
⑤(表示因果关系)每一次...的时候(总是会)
2、n. 条件；设想
参考资料：百度百科-if
20个虚拟语气句子带翻译
If he should go to Qing Hua University, he would make full use of his time. 如果他要上清华大学的话，他就会充分利用他的时间了。
If he were to come here, he would tell us about it. 如果他要来的话，他会通知我们一声。
If he were free, he would help us. 要是他有空的话，它会帮助我们的。
If he studied at this school, he would know you well. 如果他在这所学校学习的话，它会对你很熟悉。
If I had seen the film, I would have told you about it. 我如果看过这场电影，我会把电影内容告诉你了。
If I had got there earlier, I would have met Mr. Li. 如果我早点到那儿，我就会会到了李先生。
Should he agree to go there, we would send him there. 要是他答应去的话，我们就派他去。
Were she here, she would agree with us. 如果她在这儿的话，她会同意我们的。
Had he learnt about computers, we would have hired him to work here. 如果她懂一些电脑知识的话，我们会已经聘用他来这里工作了
I would have come to see you, but I was too busy. 我本该来看你了，然而我太忙了。
But for his help, we would be working now. 要不是他的帮助，我们还会在工作呢。
Without your instruction, I would not have made such great progress. 要是没有你的指导，我不会取得如此大的进步。
He would have finished it. 他本该完成了。
You could have passed this exam. 你应该会通过这次考试了。
If I were at home now. 要是我现在在家里该多好啊。
If only I had got it. 要是我得到它了该多好啊。
She examined the door again for fear that a thief should come in. 她又把门检查了一遍，以防盗贼的进入。
He started out earlier lest he should be late. 他很早就出发了以防迟到。
He goes closer to the speaker so that he can hear him clearer. 他走近说话的人以便能挺得更清楚。
He read the letter carefully in order that he should not miss a word. 他把信读得很仔细以便不漏掉一个单词。
We will finish it on time no matter what / whatever may happen. 不管发生什么事，我们都要按时完成。
We will find him wherever / no matter where he may be. 无论他在哪里，我们都要找到他。
I will wait for him no matter how late he may come. 不管他来的多么晚，我都会等他。
They began to talk warmly as if they had known each other for long. 他们开始热烈的谈论起来就好像他们已相互认识很久了。
I was astonished that he should not answer such an easy question. 我很惊讶他竟答不出如此简单的问题。
Tom insisted that he hadn’t stolen the watch. 汤姆坚持说他没有偷那块手表。
His smile suggested that he had succeeded in this exam. 他的微笑表明他在考试中成功了。
Can you imagine that he should take the first place in the long jump contest? 你能想象得到他在跳远比赛中竟获得了第一名？
I wish the bus went to the university. 我希望公共汽车能通到大学。
I wish I hadn’t wasted so much money. 但愿我没浪费这么多钱。
I"d rather you were here now. 我倒想你现在在这儿。
We"d rather you went here tomorrow. 我么倒想你明天去那儿。
if 条件句和虚拟语气
if引导的条件句中的虚拟语气：
1、if引导的条件状语从句可以分为两类：真实条件句（Sentences of Real Condition）和虚拟条件句，凡是假设的情况发生性可能很大,就是真实条件句，当假设是不大可能实现时，就是虚拟条件句。
2、表示与现在事实相反的情况.其句子结构为：从句：if + 主语+ 动词的过去式(be 用were) + ……主句：主语+ would (should,could ,might) + 动词原形+ ……
3、表示与过去事实相反的虚拟条件句.其句子结构为：从句：If + 主语+ had +过去完成式动词+ ……主句：主语+ would (should,could,might) + have +过去完成式动词+……
4、表示与将来事实相反的虚拟条件句 (对将来的事实实现的可能性不大).其句子结构为：从句：If + 主语+ should (或were) + 动词原形+……主句：主语+ would (could,should,might) + 动词原形+……
拓展资料
if的用法
1、She gets very upset if I exclude her from anything .
要是有什么事情我不让她参加，她会非常难过。
2、He asked if I had left with you, and I said no .
他问我是否和你一块儿离开的，我说不是。
3、Sometimes, that standard is quite difficult, if not impossible, to achieve .
有时即便有可能达到那个标准，那也是非常困难。
4、If I could just make another small point about the weightlifters in the Olympics .
请允许我就有关奥运会举重运动员的问题再补充一点。
5、I wonder if you"d be kind enough to give us some information, please?
请问您能不能给我们提供一些信息？
6、If there was any disappointment it was probably temporary .
即便有点儿失望，也肯定是暂时的。
7、A number of recent advances hold out if not the hope of a cure, then at least the possibility of some drug which could stop the spread of the virus .
近来的一些进展即使不能提供治愈的希望，也至少有望研制出来某种药物来阻止病毒的传播。
8、I became a distraught, worried mother, a useless role if ever there was one .
我变成了一个忧心如焚的母亲，一个全无用处的角色。