b) 用wish表示对将来的愿望时，它所引起的宾语从句中谓语动词形式为：would，could，might+ 动词原形。
c) wish用于对过去的事实表示一种不可能实现的愿望时，宾语从句中的谓语动词形式为：had+动词过去分词或could, would + have +动词过去分词。
The picture exhibition bored me to death; I wish I had not gone to it.
---“I let Joe borrow our radio for the afternoon.”
---“That’s all right, but I wish he would buy one of his own.”
I wish that he weren’t so lazy.
2) had hoped引起的宾语从句中备用语动词形式为would+动词原形，表示一种过去未实现的愿望或令人失望的事。
His father had hoped that his son would go to business with him, but his son became an artist later.
3) would (had) rather，would
as soon，would sooner和would
I’d rather you posted the letter right away. 我倒希望你把这封信立刻寄出去。
I would prefer he didn’t stay there too long. 我倒希望他不要在那儿可得太久。
I would just as soon you had returned the book yesterday.我真希望你昨天把这本书还了。
4) It’s (high, about) time that 句型中that从句中要求用虚拟语气形式，即动词要用过去式。
It’s time that something was done about the traffic problem downtown.
It is high time that we put an end to this discussion.现在是我们该结束讲座的时候了。
5) as, 或者whether…or…谓语多用be的原形，引导让步虚拟从句，这种用法通常采用倒装结构：
Church as we use the word refers to all religious institutions, be they Christian, Islamivc, Buddhist, Jewish, and so on.
The business of each day, be it selling goods or shipping them, went quite smoothly.
6)由连接词in case, so that ,unless, lest ,for fear that引起的状语从句中，谓语动词要用虚拟形式，即should(might, would)+动词原形，如：
She put a blanket over the baby for fear that he should catch cold.
The bad man was put in the soft-padded cell lest he injure himself.
7) if it were not for…与现在事实相反，if
it had not been for与过去事实相反，两个都相当于but for：
If it had not been for his help(=but for his help),we would not have succeeded.
8) 虚拟语气用于as if (though)引起的方式状语从句和表语从句中，其动词形式与wish宾语从句的形式相同。如：
She often laughs spontaneously,
and her good humor breaks out as brightly as if it were a part of the sunshine
They talked as if they had been friends for years.他们交谈着，就好像他们是我年的老朋友一样。
She looks as if she would cry.她看起来好像要哭了。
If I were in a movie, then it would be about time that I buried my head in my hands for a cry.