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/about/good)time that sb did/should do sth
例如：是时候为梦想拼搏奋斗了。
It’s high/good/about that we struggled/should struggle for our dream.
练习：玛丽是个空谈家，是她该做些什么，而非空谈的时候了。
Mary is a great talker. It’s high/about/good that she ______ something instead of just talking.
答案： did/should do
辨析：It's time for sb to do sth.
It's time for Mary to do something instead of just talking.
辨析: It is the +序数词+time that sb +完成时态
这是我第一次听到可以利用堵车时间听书的这样的想法。
It is the first time that I have heard of the idea of listening to book-reading in the traffic jam.
It was the first time that I had heard of the idea of listening to book-reading in the traffic jam.
注意：前面是is , 主从用现在完成时；前面是was 主句用过去完成时。下载本文
