请各位老师给我讲一下"虚拟语气"这个语法点,非常非常感谢!

    虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。虚拟语气在条件句中应用比较多。 一、if引导的非真实条件句 1）时态：可以表示过去，现在和将来的情况。
  它的基本特点是时态退后。 a。　 同现在事实相反的假设。 句型 ： 条件从句　　　　　主句 　　　　一般过去时　　　should( would) +动词原形 　 If they were here, they would help you。
     b。　 表示于过去事实相反的假设。 句型： 条件从句　　　　　 主句　　　　　 　　　过去完成时　　　 should(would) have+ 过去分词 　 If she had worked harder, she would have succeeded。
    　　 　 The rice would not have been burnt if you had been more careful。　 　 If my lawyer had been here last Saturday, he would have prevented me from going。
     　 If he had come yesterday, I should / would have told him about it。 　 含义：He did not come yesterday, so I did not tell him about it。
     　 If he had not been ill and missed many classes, he would have made greater progress。
   　 含义： He was ill and missed many lessons, so he did not make greater progress。  　 注：这种虚拟语气有时不用从句，用介词短语代替条件状语从句。
  例如: without, but for Without air, there would be on living things。 But for your help, I couldn’t have done it。
     c。　 表示对将来的假想 　句型：　 条件从句　　　　　　 主句 　　　　 一般过去时　　　　　 should+ 动词原形 　　　　 were+ 不定式　　　　 would + 动词原形 　　　　 should+ 动词原形 　If you succeeded, everything would be all right。
     　If you should succeed, everything would be all right。 　If you were to succeed, everything would be all right。
   　 2）混合条件句 　 主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。   　　If you had asked him yesterday, you would know what to do now。
   　 （从句与过去事实相反，主句与现在事实相反。） 　　If it had rained last night (过去), it would be very cold today (现在)。
     3）虚拟条件句的倒装 　　虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
   　 Were they here now, they could help us。   　=If they were here now, they could help us。
   　 Had you come earlier, you would have met him 　=If you had come earlier, you would have met him。
    　 　 Should it rain, the crops would be saved。 　=Were it to rain, the crops would be saved。
   注意： 　 在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was， 即在从句中be用were代替。   　 If I were you, I would go to look for him。
   　　 如果我是你，就会去找他。 　 If he were here, everything would be all right。 　　 如果他在这儿，一切都会好的。 典型例题 　_____ to do the work, I should do it some other day。
     A。 If were I　　 B。 I were　C。 Were I　D。 Was I 　 答案C。 在虚拟条件状语中如果有were, should, had这三个词，通常将if省略，主语提前, 变成 were, should, had +主语的形式。
  但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。  如我们可说 Were I not to do。, 而不能说 Weren't I to do。
   二、特殊的虚拟语气词：should 1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
     句型： 　　　　(1)suggested It is　 (2)important　　　　that…+ (should) do 　　　　(3) a pity (1)suggested, ordered, proposed, required,　 demanded, requested, insisted； + (should) do (2)important, necessary, natural, strange a pity,　 a shame,　 no wonder (3)It is suggested that we (should) hold a meeting next week。
     　 It is necessary that he (should) come to our meeting tomorrow。 2）在宾语从句中的应用 　　在表示命令、建议、要求等一类动词后面的从句中。
   order, suggest, propose, require, demand, request, insist, command, insist + (should) do 　 I suggest that we (should) hold a meeting next week。
     　 He insisted that he (should ) be sent there。 　注意： 如suggest, insist不表示"建议" 或"坚持要某人做某事时"，即它们用于其本意"暗示、表明"、"坚持认为"时，宾语从句用陈述语气。
   　 The guard at gate insisted that everybody obey the rules。  　 　判断改错: 　（错）　You pale face suggests that you (should) be ill。
   　 (对)　 Your pale face suggests that you are ill。 　 (错)　 I insisted that you ( should) be wrong。
     　 (对)　 I insisted that you were wrong。 3）在表语从句，同位语从句中的应用 　　在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气，即（should）+动词原形。
     　　 My idea is that we (should) get more people to attend the conference。 　　 I make a proposal that we (should) hold a meeting next week。
     三、wish的用法 1）用于wish后面的从句，表示与事实相反的情况，或表示将来不太可能实现的愿望。其宾语从句的动词形式为： 　　　　　　　　　　　　　 真实状况　wish后　　　　 　 从句动作先于主句动词动作　　现在时　　过去时 （be的过去式为 were）　　　　　　　　　　　　　　　 　 从句动作与主句动作同时发生　过去时　　过去完成时 （had + 过去分词）　　　　　　　　　　　　　　　　　　 将来不大可能实现的愿望　　　将来时　would/could + 　　　　　　　　　　　　　　　　　　　动词原形　　　　 　I wish I were as tall as you。
    　我希望和你一样高。 　He wished he hadn't said that。 他希望他没讲那样的话。 　I wish it would rain tomorrow。
   我希望明天下雨就好了。 2）Wish to do表达法。 　 Wish sb / sth to do 　 I wish to see the manager。   = I want to see the manager。
   　 I wish the manager to be informed at once。 (= I want the manager to be informed at once。) 3）比较if only与only if 　　only if表示"只有"；if only则表示"如果……就好了"。
    If only也可用于陈述语气。 　　I wake up only if the alarm clock rings。 只有闹钟响了，我才会醒。 　　If only the alarm clock had rung。
  　　　当时闹钟响了，就好了。 　　If only he comes early。  　　　　　　　但愿他早点回来。 4）It is (high) time that 　 It is (high) time that 后面的从句谓语动词要用过去式或用should加动词原形，但should不可省略。
   　 It is time that the children went to bed。   　 It is high time that the children should go to bed。
   5) would rather意为“宁愿”，表选择，后接不带 to的不定式。例如： I’d rather not say anything． Would you rather work on a farm? 由于 would rather表选挥,因而后可接 than。
    例如: I would rather work on a farm than in a factory． I would rather watch TV than go to see the film． I would rather lose a dozen cherry trees than that you should tell me one lie． I’d rather you didn’t talk about this to anyone．(句中的’d rather不是情态动词，would在此是表愿望的实义动词) 四、情态动词+完成时 must, would, could, should, ought to +have done 1）should/ought to +have+v-ed和shouldn’t/ought not to+have+v-ed “should/ought to+have+v-ed”表示过去应该做的事情却没有做，常含有后悔、责备、埋怨的口吻，常译作“本应当…。
    。”，“应当…。就好了”。“shouldn’t/ought not to+have+v-ed”表示过去不该做的事却做了，也常含有责备、不满的意思，常译为“本不应该…。”。
   例：With all the work finished, I should have gone to the party last night。   昨天晚上当所有的工作完成之后，我本来应该去参加聚会的。
   例：You should not have gone back to work yesterday without the doctor’s permission。 你昨天没有得到医生的允许，不应该回去工作的。
     2）may/might+have+v-ed “may/might+have+v-ed”表示对过去事情的推测，但不十分肯定。Might比may语气缓和，口气更委婉；常译为“可能(或许)已经…。
  ”。 例：A traffic accident happened yesterday and a driver may have been hurt。   昨天发生了一场交通事故，可能有个司机受了伤。
   3）could+have+v-ed “could+have+v-ed”表示过去有可能或有能力做某事，而实际未做、未能实现的事；有时也表示轻度批评，可译为“本来可以”。 4）need "不必做"和"本不该做" 　didn't need to do表示： 过去不必做某事, 事实上也没做。
    。 　needn't have done表示： 过去不必做某事, 但事实上做了。 　John went to the station with the car to meet Mary, so she didn't need to walk back home。
     约翰开车去车站接玛丽，所以她不必步行回家了。 　John went to the station with the car to meet Mary, so she needn't have walked back home。
   约翰开车去车站接玛丽，所以她本不必步行回家了。   (Mary步行回家，没有遇上John的车。) 典型例题 　There was plenty of time。 She ___。
   stn' uldn' edn'thavehurried　答案D。needn't have done。 意为"本不必"，即已经做了某事，而时实际上不必要。   　Mustn't have done 用法不正确，对过去发生的事情进行否定性推断应为couldn't have done, "不可能已经"。
   must not do 不可以（用于一般现在时）。 。