概要信息：

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虚拟语气分三大类
I.与时态相关的虚拟语气
A.现在
 If I were a girl, I would marry an old but rich man.
 If I had money, I would marry a young girl.
B. 过去
I wish I had not been to the party last night. (I went to the party last night.)
If you had helped me yesterday, I would have passed the exam. (You didn’t 
help me in the exam yesterday.)
If you had started early yesterday, you could have arrived there before 8 
o’clock.
C. 将来
If you were to/should set off tomorrow morning, you would arrive in Beijing in 
the afternoon.
D. 混合时态。
If you had helped me yesterday, I would not be sad now.
*If省略的情况
1. 倒装 (助动词提前)
Had you helped me yesterday, I would not be sad now.
Had you not been to the party last night, you would have finished your task.
2. without, but for, 
Without computer, we would not have achieved so many advances.
Without the storm, we could have arrived early.
II. demand, order, suggest, advise, ask, propose, require, 
command表示建议/命令等等的一些动词
I suggest that he (should) go there.
A. went B. goes C. gone D. go
All these facts suggested that he was a thief.
Insist 1. 坚持认为； 2. 坚持说
She insisted that he should go there.
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She insisted that what she had done was right.
My suggestion is that we finish the task immediately. 
It’s advisable that he go to Beijing immediately.
Necessary, important, strange 
It is important that he get a new coat.
It is important for him to get a new coat.
III. 杂项
Would rather +过去时
-May I smoke here?
-I would rather you didn’t.
I would rather you had not been to the party last night.
It’s (about/over) time that +过去时
It’s time we had class.
It’s time we went home.
If he had worked harder, he would not be sad now.
I need a pen to write with.
I need a piece of paper to write on.
I have a letter to write.
I have a lot of work to do.
Thanks a lot for your help in the exam. Otherwise, I wouldn’t have passed it. (I 
would have failed it)
It’s time that effective measures were taken before things go worse.
The past few decades have witnessed the dramatic increase of XXX.
Dramatically,   greatly
Drastically,
Tremendously,
Incredibly
Increase  decrease
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