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一、虚拟口气在条件从句中的用法
在富含虚拟条件句的复合句中，主从句的谓语都要用虚拟口气，现将其方法列表如下：
动词方法 时刻从句主句与如今实际相抵挡词曩昔式（be的曩昔式用were）would（could/should/might）+动词原形与曩昔实际相反had+动词曩昔分词would（could/should/might）+have曩昔分词与将来实际可以相抵挡词曩昔式
should+动词原形
were to+动词原形would（could/should/might）+动词原形
1.标明与如今实际相反的假定和成果。如：
If I were you, I should (would ,could, might) tell him the truth. 要是我是你，我就会告诉他底细了。（实际上我不是你）
If she had time, she would (could, might) help me. 假定她有时刻，她就会帮我了。（实际上她没有时刻）
2.标明与曩昔实际相反的假定和成果。如：
If I had known your telephone number yesterday, I should (would, could, might) have telephoned you. 假定昨日我晓得了你的电话号码，我就会给你打电话了。（实际上我昨日不晓得你的电话号码。）
If you had taken my advice, you wouldn't (couldn't) have failed in the exam. 假定你听了我的主张，你就不会考试不及格。（实际上你根柢没听我的。）
3. 标明与将来实际可以相反的假定和成果。如：
If it should rain, the crops would (could, might) be saved. 假定全国雨，庄稼可以就收成了。
注：在标明与将来实际可以相反的条件从句中，were to + 动词原形比照正式，常用于书面语中。
If you were to go to Beijing, you would (could, might) have a chance to visit Tian An Men Square.
二、虚拟口气的其它用法
1.虚拟口气在主语从句中的用法。
在"It is important (strange, natural, necessary) that…"这类句型中，that所引导的主语从句中的谓语动词常用 “(should)+动词原形”规划，标明某事是“重要”，“新鲜”，“天然”，“必要”等意义。如：It is important that every Beijinger (should) be able to speak English.
重要的是每个北京人能说英语。
It is necessary that he (should) be sent to hospital at once. 有必要马上把他送医院。
2.虚拟口气在宾语从句中的用法。
（1）在动词wish后的宾语从句中，标明与如今或曩昔的实际相反，或对将来的片面期望，从句一般省掉连词that。
a.标明对如今情况的虚拟：从句动词用曩昔式或曩昔进行时（be的曩昔式用were）标明。如：
I wish I knew the answer to the question. 我期望晓得这个疑问的答案。（怅惘不晓得。）
I wish it were spring in my hometown all the year around.期望我的家乡四季如春。（只是期望，实践根柢不可以能完成。）
b.标明对曩昔情况的虚拟：从句动词用 had+曩昔分词。如：
I wish (that) I hadn't wasted so much time. 我后悔不该浪费这么多时刻。（实践上现已浪费掉了。）
He wishes (wished) he hadn't lost the chance. 他真期望没有失掉机缘。（实际上机缘现已失掉了，他感到怅惘。）
c.标明对将来的片面期望：谓语动词方法为 “would/should/could/might+动词原形”，此时要留心，主句的主语与从句的主语不能相同，因为主句的主语所期望的从句动作能否完成，取决于从句主语的情绪或自愿（非动作名词在外）。如：
I wish it would stop raining. 期望雨能中止。
I wish you would be quiet. 我期望你恬静一些。
（2）在suggest（主张），demand（需求），order（指令），propose（主张），insist（坚持要做），command（指令），request（需求），desire（期望）等动词后的宾语从句中，谓语动词用 “(should)+动词原形”，标明主张，需求，指令等。如：
I suggest that we (should) start the meeting at once. 我主张马上开会。
The undergraduate insisted that he (should) go to work in the south. 这位即将结业的学生坚持要到南边去作业。
注：当suggest标明暗示，主语为something；insist标明坚持观念时，后接的宾语从句当用真实口气。比照：
His silence suggested that he agreed with my decision. 他的缄默沉静暗示着他撑持我的抉择。
He suggested that I (should) stick to my decision. 他主张我坚持自个的抉择。
He insists that doing morning exercises does good to people's health. 他坚持认为做早操对安康有利。
He insists that he (should) do morning exercises every day. 他坚持他每天都要早操。
3.虚拟口气在表语从句中的用法。
当主语为advice, suggestion, order, proposal等词时后接表语从句，表语从句中的谓语动词常用“(should)+动词原形”规划，标明或人主张、?怠⒅噶畹鹊哪谌荨Ｈ纾?
My advice is that you should practise speaking English as often as possible. 我的主张是你尽可以常常地操练说英语。
The order from the commander was that the troops should set off for the front immediately. 司令官的指令是部队当即开拔去前哨。
4.特别的虚拟口气规划。
（1）虚拟口气用在状语从句中
由as if 或as though引导的状语从句标明比照或方法时，从句中的谓语动词用虚拟口气。动词方法用动词的曩昔式(be→were)或had+曩昔分词。如：
The teacher treats the student as if he were her own child.
这位教师带这位学生就象她的亲生孩子相同。
He speaks as if he had been to the United States.他说得好象他真的到过美国似的。
（2）在It is time (that) …; I'd rather (that)…句型中从句的谓语动词常用动词的曩昔式标明虚拟口气，意思是“该干某事了，时刻现已有些晚了”“我甘愿/期望”。如：
It is time that we did something to stop pollution. 该咱们做些啥阻止污染的时分了。
It is time that Father picked up Lily from the kindergarten. 该父亲去幼儿园接莉莉的时分了。
I'd rather you told me the truth. 我真期望你告诉我底细。
I'd rather I didn't see you again. 我甘愿不再会着你。
5.虚拟口气在同位语从句中的用法
在名词advice, suggestion, order, proposal等后接的同位语从句中，谓语动词用虚拟口气，起方法为 “(should)+动词原形”，阐明“主张”，“?怠保爸噶睢钡鹊木咛迥谌荨Ｈ纾?
The order came that the work should be finished two days ahead of time. 提前两天结束作业的指令传来了。
Reluctantly she accepted their proposal that she should be operated on. 她牵强承受了他们要她去承受手术的主张。
难点释疑：
（一）主从句时刻纷歧致情况下的虚拟口气（混合条件句）
有时条件从句中的动作和成果与主句中的动作，发生的时刻纷歧致，这时动作的方法应根据它所标明的时刻加以调整。如：
If you had followed my advice, you would be able to finish the work now. 假定你其时听了我的话，如今就能结束这份作业了。（从句阐明曩昔，主句阐明如今。）
If I were you, I would have gone to her birthday party. 假定我是你，我就去参加她的生日晚会了。（从句阐明如今，主句阐明曩昔。）
If you hadn't lent me some money, I couldn't have bought the new house and most likely I would be still living in the dangerous house now. 假若你不借钱给我， 我不可以能买下这幢新房，很可以如今还住在危房里。（从句阐明曩昔，主句阐明曩昔和如今。）
（二）宛转条件句
非真实条件句中的条件从句有时不表出来，只暗含在上下文中，这种语句叫做宛转条件句。宛转条件句大体有三种情况；
1. 条件暗含在短语中。如：
(1)W hat would I have done without you?
如没有你，我会怎么办呢？(条件暗含在分词短语without you中)
(2) It would be easier to do it this way.
这样做会比照简略。(条件暗含在不定式短语to do it this way中)
(3) This same thing, happening in wartime, would lead to a disaster.
相同的事，如发生在战时，就会变成大祸。（条件暗含在分词短语happening in wartime中）
(4) But for your help we couldn't have succeeded in the experiment.
假定没有你的协助，咱们的实验是不会成
功。（暗含条件是but for your help）
(5) He must have the strength of a hippopotamus, or he never could have vanquished that great beast. 他必定是力大如河马，否则他绝不会打败那只巨大的野兽。（暗含条件是连词or）
(6) Alone, he would have been terrified. 如是单独一人，他是会感到惧怕的。（暗含条件是alone）
（三）条件从句中省去if的情况
在if引导的标明虚拟的条件状语从句中，常可以省掉if，将had, were或should提至句首。
Had I seen the film, I would have discussed it with them last night. 假定我看了那部影片，昨晚我就可以和他们一同谈论了。
Were I a bird, I could fly freely. 假定我是一只小鸟，我就能安适遨游。
Should it rain next week the farmers would have a good harvest. 要是下周能下雨的话，农我们就能有个好收成了。
