Question

It is high time that 后面到底跟什么虚拟语气啊？是过去式还是加should?有和It is time that有什么区别？

老师说只能跟过去式，也有的人说既能跟过去式和should但是不能省略should。

Answer 1

后跟过去式，后者不是虚拟语气用法
1. 目前，虚拟语气的were除了在If I were you 的结构中不能改动外，其他有些情况可以用was。
2. 如果表示否定的意思，多用过去时结构，用should和were to 较少。
（二）、虚拟条件句中的省略和倒装
若符合下列条件，可以省略if:
1.必须是非真实条件句，并且有were, had, should时，才可以省略if.
2.省略if时，主语与were, had, should的位置必须相互调换。
万一我见到她，我会告诉她的。If I should meet her, I would tell her.
Should I meet her, I would tell her.
如果我处在你的位置上，我会做得更好。
If I were in your position, I would do it better.
Were I in your position, I would do it better
如果他们准备了的话，他们应该能成功的。
If they had made preparations, they would have succeeded.
Had they made preparations, they would have succeeded.
(三)含蓄条件句
假设情况不以if条件句表现出来，而是通过某个介词或介词短语，不定式表现出来。如with，without，but，but for， otherwise等。
I lost her phone number, otherwise, I would have rung her up.
If I had not lost her phone number…
But for your help, I would not have the
chance to go to school.
If you had not helped me…
二、用在宾语从句中的虚拟语气
（一）在wish引导的宾语从句中，表示未能实现或不可能实现的愿望，用虚拟语气。 主句wish的时态不影响从句的时态。 1.与现在事实相反的愿望，从句动词用一般过去时(be变为were）
我希望我是你多好啊！
I wish I were you.
2.与过去事实相反的愿望，从句动词用过去完成时
我多么希望我以前多学一些啊！I wish I had learned more.
他要是不犯那个大错误，该多好啊！He wishes he hadn’t made the big mistake.
3.与将来事实可能相反的愿望，从句动词用“would/should/could/might+动词原形” 。
最后一次机会他也失去了，他多么希望他能再有一次机会啊。
The last chance has been lost. How he wishes he would have another chance.
（二）在具有愿望、请求、建议、命令等主观意愿的动词
1. (demand, advice, insist, require, suggest, propose, order, recommend, …) 谓语动词用(should) +动词原形。
注意：
1. 如果宾语从句的动词是否定的，否定词not的位置应在动词之前。
The head nurse insisted that the patient （should) not be moved.
2. 另外，如suggest表达“暗示”，insist表示“坚持某种说法”时，后面的从句不用虚拟语气
3. 除此之外，上述动词的其它形式也要求用虚拟式
①在It is+上述动词的过去分词，其后的主语从句需要虚拟。
It is suggested that pupils (should) wear school uniforms.
② 在上述动词相应的名词形式作主语+系动词，其后的表语从句需要虚拟。
His suggestion was that classes (should) be re-scheduled.
③ 在对上述动词相应的名词进行解释的同位语从句中
The workers raised the demand that their pay (should) be increased to cope with the inflation.
（三） Would rather (that) + 从句
A + would rather (that) + B
+ 过去时 （与现在或将来相反）
+ 过去完成时 （与过去相反）
你要是去那里就好了。I would rather you had gone there.
你要是现在留在家里就好了。I would rather you stayed at home now.
三、其它形式的虚拟语气
1. It is + necessary, important, essential, imperative, urgent, preferable, vital, advisable等双音节或多音节的形容词后的主语从句中，需要使用虚拟语气。
It is necessary that you (should) listen to the teacher carefully.
It is essential that you (should) be able to pronounce every single word correctly.
2. 在It‘s (high/about) time 之后的定语从句中需用虚拟语气。
谓语动词用过去式。
It is high time that you went to school.
⒊ 虚拟语气在as if / as though 引导的方式状语从句中的应用
状语从句的谓语动词形式与wish后的宾语从句基本相同
主句+as if (though)+主语+ were/过去时 〉表示与主句动作同时发生 could/would +动词原形〉表示动作可能在将来发生 had+过去分词〉表示从句谓语的动作发生在主句动作之前 He treats me as if I were a stranger. She talks about it again and again as if she would never end. They talked as if they had been friends for years.
⒋ 在lest, for fear that 唯恐; 以免 引导的状语从句中，谓语动词多用虚拟语气，(should )+ 动词原形。
The mad man was put in the soft-padded cell lest he injure himself.（1998年1月四级第38题）
5. If only + 从句 表示“愿望”的虚拟 动词向前推一个时态。
现在时：If only I were here. 过去时：If only I had been here. 将来时：If only I would be here.

Answer 2

It is high time that you(should) make/made a decision.
早就到了你做出决定的时候了。
It is high time that we began the meeting.
正是我们开会的时间了。
确实都可以，should也比较少省略，但也不是不能省略的。
和it is time that只有语气上的差异，意思是一样的。
还有It is time for sb. to do sth也是一样的意思。
It is (high) time for us to begin the meeting.