虚拟语气经典句型关键词：虚拟语气If+were/did/(动词过去式)，主语+would/might/should/could+doIf I were you, I would not be so proud.如果我是你，我不会如此自负。
I don't have a cellphone. If I had one, it would be convenient for me to get in touch with others.我没有手机，如果有的话，和别人联系就方便多了。
If I were in your position, I would think better of it.如果我处在你现在的境地，我会重新考虑的。
0 &&句型2：表示对过去或已经发生事情的虚拟假设If+had done，主语+would/might/should/could+have doneWhat a pity it is that you didn't attend the concert yesterday! If you had attended it, you would have seen the famous singer.真遗憾你昨天没有去听音乐会。
如果你去了，你就会见到那位名歌手。
Anyone in his position would have done the same.=If anyone had been in his position, he would have done the same.无论谁处在他当时的境地都会像他那样做的。
句型3：表示对将来的假设If+were/did/(动词过去式)/should/were to do，主语+would/might/should/could+doIf we were to panic, we would not be able to give proper first aid.如果我们惊慌的话，我们就不能进行急救了。
If it were to rain(=Should it rain=Rained) tomorrow, we would not go for a picnic.如果明天下雨的话，我们就不去野炊了。
If you shouldn't pass the college entrance examination, what would you do?万一你高考不中，你该怎么办？0 &&句型4：if onlyif only引起的感叹句，相当于“How I wish+宾语从句”，意为“但愿......，要是......就好了”。
If only he could come!要是他能来就好了。
If only we students didn't have so much homework!要是没有那么多作业该多好！If only I hadn't been so careless in the exam!我当时没有那么粗心就好了！0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型5：要不是......；如果不是......If it were not for ... (=Were it not for ...)If it hadn't been for ... (=Had it not been for ...)If it hadn't been for the determined captain, all the passengers on board wouldn't have been saved.要不是有意志坚定的船长，船上的乘客就不会得救。
If it were not for your rich parents, you couldn't live so easy a life.要不是因为你有钱的父母，你的生活不会如此安逸。
0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型6：but for, but thatbut for+名词和but that+从句，意为“倘若不是，要不是”，接虚拟语气。
But for the Communist Party of China, the People's Republic of Chia couldn't have been founded.=If it hadn't been for the Communist Party of China, the People's Republic of China couldn't have been founded.没有共产党，就没有新中国。
But for the air and water, nothing could survive.=If there were not air and water, nothing could survive.没有空气和水，什么都不能存活。
She could not have believed it, but that she saw it.若非亲眼所见，她是不会相信的。
0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型7在suggest, proplse, insist, demand, require, request, order等表示建议、要求、命令的(动词后接的)名词性从句中需用虚拟语气，基本句型：主语+(should)+动词原形。
Mother insisted that John (should) go to bed at 9 o'clock.（宾语从句）Many hospitals recommended that we use the letter DR ABC to remember what to do when giving first aid.（宾语从句）It was required that children (should) be sent to school when they reach the age for school.（主语从句）The suggestion that he (should) be invited was rejected.（同位语从句）That is their demand that their wages (should) be increased.（表语从句）0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型8it's necessary/important that sb. should do..., should可以省略With the society developing very fast, it's quite necessary/important that we (should) have a good knowledge of English and computer.随着社会的快速发展，我们有必要精通英语和电脑。
It's necessary that John take the exam first.约翰有必要先参加考试。
0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型9it's strange/a pity/surprising that sb. should do..., should表示“竟然”It's a pity that she should miss the chance to go abroad.很遗憾她错过了这次出国的机会。
It's really surprising that a prophecy (预言) should coincide with the fact so exactly.令人惊讶的是，预言和事实竟然如此巧合。
It's strange that he shouldn't pass the exam.奇怪的是他竟然没有通过考试。
0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型10：wish+宾语从句，表示不大可能实现的愿望表示现在的愿望：主语+动词过去式；表示过去的愿望：主语+had+过去分词；表示将来的愿望：主语+would(could)+动词原形。
How I wish we students had more free time to relax ourselves!I failed in the maths exam. How I wish I hadn't wasted so much time playing.What a pity you can't go to the party. How I wish I could dance with you at the party.0 &&image.height>0){if(image.width>=510){this.width=510;this.height=imag e.height*510/image.width;}}">句型11：It's (high/about) time that sb. did/should do ...早就该.....It's time that we took action and did our bits for the AIDS patients.=It's time that we should take action and do our bits for the AIDS patients.我们早就该行动起来,为爱滋病人尽我们的一份力。