it's high time后面可以加动词原形，也可以加动词过去式。这两种结构是可以互换的，是虚拟语气中的知识。还有一种结构就是it is high time+to do sth,不是虚拟语气。例句：It's high time that you started working.你早该开始工作了。

it's high time和should+动词的连用

It's high time that...是应立即做(某事)的时候了，早就到了做什么的时候了。high time：正是时候,早该。

should表示义务、bai责任、建议或劝告，有“应当、应该”的意思。

It is(high)time that后面的从句，谓语动词要么用过去式或者用should+动词原形，但should不可省略，这是虚拟语气的用法。两者意思一样。意思是：“是某人做什么什么的时候了”

两者的例句

1、It is high time that the children went to school.孩子们该上学了

2、It is high time that the children should go to school.孩子们该上学了

1、I think it's high time that we stopped having fish and chips every Friday.

我觉得我们真的得改变每周五都吃炸鱼和薯条的习惯了。

2、All right,it's high time we did.

好的，现在该是送去的时候了。

3、It's high time he made up his mind.

他该拿主意了。

4、It's high time you left home for work.

你真该离家去上班了。

5、It's high time you were all in bed!

它们全都在各种借口下走掉了。

6、It's high time we talk some sense into her.

是时候我们得跟她讲讲大道理了。

7、It's High Time to Adjust Our Development Strategy

是调整发展战略的时候了

8、It's high time they began to take you seriously.

现在他们应该开始认真对待你了。

9、It's high time we took effective measures to improve our work.

现在该是采取有效措施改进工作的时候了。

10、I think it's high time you bought the house.

我看你现在是必须买这所房子的时候了。

11、It's high time to try it.

这是该试一试的时候了。

12、and it's high time they became more independent.

但是它们自立的时候到了

13、It's high time we got a pay rise!

我们应该马上涨工资才是！

14、It's high time that you started working.

你早该开始工作了。

15、It's high time we talk about these things,she said.

她说：是时候我们该讨论讨论这些事情了。她是促进母乳喂养的组织为了孩子好的创办人之一，该组织支持那些在婴儿期后仍给孩子母乳喂养的女性。

16、It's high time that we knocked off work.

我们早该停止工作了。

17、It's high time some steps were taken.

现在该是采取一些措施的时候了。

18、I believe it's high time you changed your sales approach.

我认为你该变换销售方式了。

19、It's high time we should voice our opinion.

是我们说出自己观点的时候了。

20、It's high time you thought about getting married.

你实在该考虑你的婚姻问题了。