the first time 引导的时间状语从句是有时态限制的。
1、the first time 后面可以跟过去式，表示对过去的事情描述是第一次做某事：
例句：
The first time I saw him.I knew he was the one.
第一次见到他，我就知道他是我命中注定的那个人。
2、后面还可以跟一般现在时，对现在事情进行描述：
例句：
It is the first time she sees the snow falling.
这是她第一次看到下雪。
3、也可以跟完成时
例句：
It is the first time since 1976 that an asteroid has come so close to Earth,and the first time astronomers have ever had this much advance notice.
这是自1976年以来第一次有小行星如此近距离接近地球，也是天文学家首次提前如此长的时间得到确切消息。
This is not the first time we have suffered.
这不是我们第一次受到这种罪了。
扩展资料
例句：
1、Streams had run dry for the first time in memory.
记忆中，小溪第一次干涸了。
2、It was the first time we admitted to ourselves that we were tired.
这是我们第一次承认自己累了。
3、It was the first time I had put it all down on paper. I found it helped.
这是我第一次把所有的东西都写在纸上，我觉得这有帮助。
4、I remember the first time I went onstage. I freaked out completely.
我还记得自己第一次登台的情形。我完全吓坏了。
5、This is the first time she has experienced disappointment.
这是她第一次感受到失望。