虚拟语气主要有与目前事实相反、与过去事实相反、与以后事实相反的虚拟，与几种特殊状况，should、wish等虚拟语气。
1. 与目前事实相反的虚拟：
If + did / were + ..., ... would/ should/ could/ might + do
If I were you, I would go abroad at once.
If he knew it now, he could help me.
2. 与过去事实相反的虚拟：
If + had done + ..., ... would have done ...
If I had known your telephone number yesterday, I would have phoned you.
If you had come here a little earlier just now, you might have met her.
3. 与以后事实相反的虚拟：
If + should + v., ... would + v.
If it should rain tomorrow, you could stay at home.
If I should fail, what should Ido?
If + did / were to + v ..., would + v.
If the sun were to rise in the west, I would lend you the money.
If you finished it in 3 minutes, I would give you my car.
4. 金牌特殊重点
[简单联想记忆]：
● 下列动词后的“宾语从句”中需要用虚拟形式，即should + 动词原形，shoud在美国英语中要省略。此类容易见到的动词有：order, ask, decide, demand, require, recommend, suggest, insist, advise, etc.
He suggested that we help them with English.
The teacher ordered that the homework be finished within half an hour.
● 下列名词后的同位语从句中要用“should + 动词原形”的虚拟。此类容易见到的名词有：suggestion, order, request, demand, importance, proposal.
He made a suggestion that we have a fancy dress party.
I think it is a thing of importance that it be done soon.
● It is / was important / necessary / natural / essential / advisable / strange / surprising, ect. + that +主语+ should + v.
It is strange that you should say such a thing.
It was important that you should tell me all the information.
● wish后的宾语从句中，as if 后的状语从句中，须用下列的虚拟形式：
主 + wish+ + 主 + did / were
had done
would+ v.
I wish that I met my uncle now.
I wish I had met my uncle yesterday.
I wish I could meet my uncle tomorrow.
● It is time that ... + did / were ...
It is time that you went to bed.
● would rather that ... + did / were ...
I would rather that you were not here now.
● would sooner that ... + did / were ...
I would sooner that you got up earlier.
I would sooner that you were not my brother.
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