虚拟语气if的三种用法,if虚拟语气的三种句型例句？ _知识经验

【虚拟语气if的三种用法,if虚拟语气的三种句型例句？】一虚拟语气if的三种用法、对现在情况的虚拟

条件从句中谓语动词用一般过去式，主句用“would/should/might/could 动词原形”形式，表示对现在不可能实现情况的假想。
If I were you,I would choose to work in a small town.
如果我是你，我会选择在小城镇工作。（事实上我不是你）
If I had a map now,we could easily get out of the forest.
如果现在有地图，我们能很容易地走出森林。（事实上是现在没有地图）
注意：在条件从句中，如果谓语动词是be的形式，不管主语是单数还是复数，书面语中用were,而口语中如果是单数，也可以用was,不过在if I were…中一般用were.
If the world were perfect,how could we enjoy the pleasure and comfort of being successful?
世界若完美，我们如何能尝到创造成功的快慰？
二、对过去情况的虚拟
条件从句中谓语动词用过去完成式，主语用“would/could/should/might have 动词的过去分词”形式。
If it had not been for your help yesterday,I could not have caught the bus.
如果昨天没有你的帮助，我不会赶上公交车。（事实是你昨天已经帮助了我，所以我赶上了车)
三、对将来情况的虚拟
在表示与将来事实相反的条件从句中，谓语动词可用should do,were to do或动词的过去式三种形式表示，但意义略有不同。should表示的可能性最大，动词过去式的可能性次之， were to do 的可能性最小。
If things were to be twice ， all would be wise.
假如凡事都可以重新做一次，人人皆可成为聪明人。（事实是并不是所有的事都可以重新做一次) 。
if only引导的虚拟语气的用法。
If only: 常常用来表示强烈的愿望，因为用于虚拟语句时和wish类似，表达强烈的遗憾或与真实条件不符的愿望。因而使用起来的形式与wish相同。
①表示与将来情况不同：if only＋从句主语＋would(could, might) 动词原形
If only she would try again.
我希望她能再试一次
②表示与现在情况不同：if only＋从句主语＋动词过去式
If only I wasn’t going to London.
我希望我没去过伦敦.
③表达与过去情况不同：if only＋从句主语＋would/could have/had＋过去分词
If only you had come to my birthday party.
你要是来了我的生日晚会就好了。
一般现在时: Even if we finished this program now ， it is too late for the new one.
一般过去时： Even if we had finished this.progam last Sunday ， it is too late for the new one.
一般将来时：Even if we were to finish this program tomorrow, it is too late for the new one.

虚拟语气if的三种用法,if虚拟语气的三种句型例句？

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