先看一道试题：
It’s time the child __________ to bed.
A. goes B. going C. went D. to go
此题应选C。关于It’s time＋that从句，注意以下几点：
1. 从句谓语通常用过去时态或should＋动词原形：
It’s time we started. 我们该动身了。
It is time that you left here. 你该离开这儿了。
It’s time you studied hard. 你该努力学习了。
有时也用 should 动词原形或用过去进行时，有时甚至将 should 省略(即只用动词原形，为非正式的美国口语)：
我们该走了。
正：It is time we left. (常见)
正：It is time we should leave. (可用)
正：It is time we were leaving. (可用)
正：It is time we leave. (少见，非正式美国口语)
2. 其他几点注意处：
(1) 其中的 It is 有时根据情况也可改为 It was，其后的时态不受影响：
你该上床睡觉了。
正：It is time you went to bed. (指现在而言)
正：It was time you went to bed. (指过去而言)
(2) time 前可以用 high，about 等修饰。
It is high time you told her the truth. 你该把真相告诉她了。
It is about time that I wrote her a letter. 我该给她写封信了。
知识拓展：it's time to 和It's time for的区别
意思一样,都是‘该是做某事的时候了!’ it is time to do sth强调的是动作，而it is time for sth强调的是某事某物。
1、it's time to 是 … 的时候了
It's time to knock off. 该收工了。
It's time to wise up and tell those around you that enough is enough.
现在该觉醒了，告诉你周围的人要适可而止。
2、for 后跟 名词或doing sth.
3、to 后跟 do sth.
比如：
It's time for lunch!
意思是‘该吃午饭了!’
It's time to get out of here!
It's time for getting out of here!
意思是‘该是离开这里的时候了!’
