1. It‘s time for sth. 是做……的时候了。
2. It‘s time （for sb.） to do sth. 是（某人）该干……的时候了。
3. It‘s （high） time + that从句（that可以省略，从句谓语动词用虚拟语气）是某人（早）该干某事的时候了。
4. It （This / That） is the first （second， third ……） time + that从句（从句要用现在完成时）。这（那）是某人第一（二、三……）次干某事。如主句谓语动词是过去时，则that从句要用过去完成时。
5. by the time引导的时间状语从句。若从句用一般现在时，主句要用将来完成时；若从句是一般过去时，主句要用过去完成时。
6. each time（每次），next time（下次）， any time（任何时候）等词组引导的时间状语从句。
7. the first / second / third …… time 可以引导时间状语从句。
8.There was/is a time when+从句：曾经一度……，先前……，那时
when+从句修饰a time
今天重点举例解说这个句型。
There was a time when Charles was coasting at school and I should have told him to buckle down.
有一段时间查尔斯在学校不太用功，我当时应该让他加把劲的。
There was a time when each teacher spent an hour, one day a week, testing pupils in every subject
曾经，每个老师每周都有一天花上一小时对学生的每门功课进行测试。
There was a time when Liverpool players never seemed to get injured, but now they are going down like ninepins.
利物浦队的队员一度似乎怎么都不会受伤，但现在一倒就倒了一片。
There is a time when I have to depend on myself for a living.
有一段时间我不得不依靠自己谋生。
There was a time when I had to depend on myself for a living.
有一段时间我不得不靠自己谋生。
注意时态的变化和呼应。
There was a time when black people were treated badly.
曾经黑人受到虐待。
类似句型还有：
It was/is a time when+从句：曾经一度……，先前……,那时
This/That was/is a time when+从句：曾经一度……，先前……,那时
It was a time when people weren't so hung-up about health
那时人们不太关注健康。
《柯林斯高阶英汉双解学习词典》
It is a time when pop art is very much in fashion.
这是一个流行音乐成为时尚的年代。
It was a time when motorcars were rare.
那是汽车很稀有的期间。
It was a time when the tribe lived quietly in its own corner of the world.
那个时候部落宁静地居住在世上属于它们自己的角落里。
It was a time when she could not bear the pain and wanted to kill herself.
她曾经无法忍受病痛，想结束自己的生命。
This was a time when you had to keep calm.
这段时间你必须保持镇定。
This was a time when one had got to have a passbook to live in Johannesburg.
这是每个人必须有通行证才能居住在约翰内斯堡的时期
That was a time when I took a crazy liking to rock 'n' roll.
那个时候我已经开始非常狂热地去喜欢摇滚乐。
That was a time when Michael Jackson still looked relatively handsome.
那个时候正是迈克尔杰克逊还长得比较漂亮的时候。
