It's high time + that 从句谓语动词有两种形式：
动词的过去式(be用were)；或者用shoud + 动词原形（should不能省略)；
句型是虚拟语气句型，意思“现在某人该做某事了”。
例句：
1、Therefore, it is high time that parents and schools should be alert to the problem and restrict children's access to those computer games.
因此，现在正是家长和学校应该对这个问题提高警觉，限制学生接触电脑游戏。
2、It is high time that we threw away the phone and raised our heads up. Do cherish the ones around us and appreciate the splendid scenery ahead of us.
是时候，我们把电话扔了，抬起头来。珍惜身边的人，欣赏我们在我们前面的辉煌。
3、It is high time that we should tell him the truth.
是咱们该告诉他实情的时刻了。
扩展资料
相关句型：
It's about time that，从句谓语动词同样用过去式或shoud + 动词原形（should不能省略)。
例句：
1、It's about time that it did. I don't know what took It'so long a time.
差不多是时候了。不知为什么拖了这么长时间。
2、It's about time this old sewing machine was put out to pasture.
这部旧缝纫机大概到了被淘汰的时候了。
从句谓语动词要用过去式或用should加动词原形，但should不可省略。
例如：It is time that the children went to bed.
It is high time that the children should go to bed.
二、It's time…句型是中学英语里使用频率较高的句型，其意为“该是……的时候了”。用法灵活多变，也是大家以掌握的句型。现就其有关句式归纳如下：
⑴ It's time for + n.“该是（干）……的时候了。”例：
Boys and girl, It's time for class.
同学们，该上课了。
⑵ It's time + (for sb.) to do sth. .表示“该是（某人）干……的时候了。”例：
It's time for you to clean the classroom.
该是你打扫教室的时候了。
It's time to go to school.
该去上学了。
⑶ It's time + that clause 时，that可省略，time可由high,about修饰，从句中的谓语动词有两种形式，或者用动词的过去式(be用were)；或者用shoud + 动词原形（should不能省略)。此句型为虚拟语气句型，表示“现在某人该做某事了”。含有该事早该去做而未做，现在去做似乎都为时已晚的意思。例：
It's time （that）we went to bed.
我们该去睡觉了。
It's high time that the article were published.
发表这篇文章是适时的。
It's time you should do cleaning.
你该去打扫卫生了。
⑷ It's + the/序数词+ time +to do sth. 表示某人第几次做某事。例：
It is my first time to write letter in English.
这是我第一次用英语写信。
⑸ It's + the+序数词+ time+ that clause.也 表示某人第几次做某事。例：
It is my first time that I've even written letters.
这是我第一次用写信。
句型⑷ 句型 ⑸ 可以互换。
a. It is time + for 名词
b. It is time + for sb .to do sth
2. 有high时：
“high”作定语时，表示正盛的（时机）成熟了
如high noon 正午
“about”也可以用在这个句子上，表示“大约，差不多”
a.It is high(about) time (that )+ sb did sth
b.It is high(about) time (that ) + sb didn't do sth
注：that 后跟虚拟语气，后跟动词的一般过去式，表示“是某人做。。。的时候了”或者“是某人不做。。。的时候了”本回答被提问者采纳
It is time that the children went to bed.
It is high time that the children should go to bed.
该是孩子们睡觉的时间了。
例句：
It is high time you started off．是你该动身的时候了。
Now it's high time we were off．现在我们该走了。
It's high time he found a job．他该找份工作干干了。