可以加動詞原形，也可以加動詞過去式。It's high time that意思是應立即做(某事)的時候了，早就到了做什么的時候了。It is(high)time that后面的從句，謂語動詞要么用過去式或者用should+動詞原形，但should不可省略，這是虛擬語氣的用法。兩者意思一樣。

it's high time用法

1、It is (high) time that表示“是該做......的時候了。

后面的從句謂語動詞要用過去式或用should加動詞原形，但should不可省略。

2、It’s?high/good?time?that+從句句式

這種句式常用it作形式主語，that從句為主語從句，句中常用一般過去時或“should+do”的虛擬語氣結構。注意：其中should不可省略;?time前不加定冠詞the

結構：It’s?(high/about/good)time?that?sb?did/should?do?sth

3、還有一種結構就是it is high time+to do sth,不是虛擬語氣，意思是到做......的時候了。

it's high time例句

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

我覺得我們真的得改變每周五都吃炸魚和薯條的習慣了。

All right, it's high time we did.

好的，現(xiàn)在該是送去的時候了。

It's high time he made up his mind.

他該拿主意了。

It's high time you left home for work.

你真該離家去上班了。

It's high time you were all in bed!

它們?nèi)荚诟鞣N借口下走掉了。