Question

it is high time that虚拟语气

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

It is (high) time that表示“是该做．．....的时候了。这种句式常用it作形式主语，that从句为主语从句，句中常用一般过去式或“should+do”的虚拟语气结构。注意：其中should不可省略，time前不加定冠词the。

结构：It's high time that sb did/should do sth

例如：It's high/good/about that we struggled/should struggle for our dream. 

是时候为梦想拼搏奋斗了。

主语从句结构及用法

主语从句使用陈述语序，其通常结构为“引导词+主语+谓语+其他成分＂,但当连接代词同时充当从句主语时，其结构为“连接代词+谓语+其他成分”。

引导词：

1、that引导

例如：That you are coming to London is the best news I have heard this long time.

2、whether引导

例如：Whether they would come to conference was a question.

3、连接代词引导： who，whom，whose，what，which，whoever，whomever，whichever， whatever。

例如：Whoever is top from wins the game when two matched players meet.

4、连接副词引导： therefore，besides，otherwise，however，moreover，stil，thus， meanwhile。

例如：How this happended is not clear to anyone.

5、关系代词型what引导

例如：What shoked me was that she never wash her own clothes.

Answer 2

it is （high/about）time +（that）从句。从句要用虚拟语气，谓语动词用过去式或者should do,且should 不可省略。
与it is time that区别，it is 后面可以填high或者about（表强调），也可以不填。
不论有没有high或者about，他们后跟的从句都需要用虚拟语气。

Answer 3

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.