itwas是什么时态

It was+时间段+since 从句时态用过去完成时，(到过去某个时间为止)做某事有多长时间了；

例句

It was 11 years since we had started school.

我们开学已经11年了。

It was a new era in the history of our country.

这是我国历史上的一个新纪元。

It was a chance meeting that would change my life.

那次偶然的会面改变了我的一生。

It was the best day of my life.

这是我一生中最美好的一天。

It was time to put their suggestion into practice.

那时就该把他们的建议付诸实施了。

It was the main focus of attention at the meeting.

这是会议上关注的主要焦点。