(1)如果我是你，我会接受邀请的。 If I were you, I should accept the invitation.
If I had time, I would go there.
If you had come earlier, you couldn't / wouldn't have missed the bus.
If he had seen you yesterday, he would have returned your book.
If it should rain / were to rain / rained tomorrow, the sports meet would be put off.
If you dropped / should drop / were to drop the glass, it would break.
含蓄虚拟句(即含有without / but for, otherwise / or等词的句子)
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Human beings would die without water. (＝Human beings would die if there were no water. )
I couldn't have succeeded but for your help. (＝I couldn't have succeeded if you hadn't helped me. )
I had no money then. Otherwise I would have bought that book.
(＝If I had had money then, I would have bought that book. )
【疑难剖析1】含有without / but for，otherwise / or等词的句子谓语结构等同于if主从句中主句的谓语结构。
Had they had time(＝If they had had time)， they would have certainly come to help us.
Should it be fine(＝If it should be fine)，we would go for an outing.
Were I you(＝If I were you), I would go.
If the weather had been finer, the crops would be growing still better.
If you had followed the teacher's advice, you wouldn't be in hospital.
How he wishes that he were a bird.
I wish I had seen the film last night.
We wish we would live on the moon one day.
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I would rather you were not here with me now.
I would rather you hadn't done that.
【结论2】would rather / prefer ＋ that－从句(从句用虚拟语气)
She speaks English as though she were a native of New York.
【结论3】as if / though ＋ 从句中谓语用相应的过去时态(等同于wish从句用法)。
If only you hadn't told me the news.
【结论4】if only (要是……就好了)，句中谓语用相应的过去时态(等同于wish从句用法)。
Even though I had been very busy then, I would have helped you.
Even if I might run, I wouldn't do that.
The doctor suggests I (should) exercise every day.
It is suggested that I (should) exercise every day.
The doctor's suggestion is that I (should) exercise every day. 医生给我的建议是每天做运动。(表语从句)
The doctor's suggestion that I (should) exercise every day sounds reasonable. 医生要我每天做运动的建议听起来挺合理的。(同位语从句)
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两个命令：order, command (名词是order, recommendation)
三个建议：advise, suggest，propose(名词是advice, suggestion, proposal)
四个要求：demand, require, request, desire(名词是demand, requirement, request, desire) 注意：1. suggest 意为“表明，暗示”时，不用虚拟语气；
如：His face suggested that he was very sad.
如：The man insisted my little brother was a thief.
It is important that we (should) have a good knowledge of computer science. 你居然没参加会议，真是可惜。 It is a pity that you (should) be absent from the meeting.
他竟然是名医生，我们很惊讶。 We are surprised that he (should) be a doctor.
【结论2】虚拟语气用在“It's＋形容词 / 名词＋that…”这类句型中，表示说话人“强烈”的感情色彩，此时，从句用should ＋动词原形 / should ＋ have done (表示动作在过去已经发生)，should 可译为“应该；居然，竟然”。should 可以省略。
①It is important / necessary / strange / surprising / funny / natural ＋ that－从句 ②It is a pity / a shame / an honour / no wonder that－从句
③主语 ＋ be ＋ sorry / disappointed / surprised ＋ that－从句
①We got up early for fear that we should miss the first bus.
②We got up early lest that we should miss the first bus. 【结论3】在in case, for fear (that), lest等引导的状语从句中，谓语动词用“should＋动词原形”。
Heaven help him!
God bless you!
May you succeed!
Long live the People's Republic of China!
①was / were supposed to have done 理应做……
②was / were to have done 本计划做……
③had thought / believed…， but…本以为……
④had planned / intended…，but…本计划……，本打算……
⑤had wished / hoped…，but…本希望……
⑥It's (about / high)time that－从句，某人该做某事了
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