1. 表示某个动作或状态从过去某一时刻开始一直持续到现在:
I have lived in this city since 2010. (自从2010年以来,我一直住在这个城市。)
They have been friends since childhood. (他们从小就是朋友。)
2. 表示某个动作或状态在某个过去的时间点结束:
He has been single since his divorce in 2018. (自从2018年离婚后,他一直是单身。)
The company has been profitable since the last quarter of 2020. (自从2020年最后一季度以来,公司一直盈利。)
3. 与现在完成时态连用,表示某个动作或状态从过去某个时间点开始一直到现在已经完成:
I have read all the books since I started this project. (自从我开始这个项目以来,我已经读完了所有的书。)
They have learned a lot of new skills since they started their new job. (自从他们开始新工作以来,他们已经学会了很多新技能。)
4. 表示原因或理由:
I haven't seen him since he was sick. (自从他生病以来,我一直没见过他。)
We haven't talked much since we had a falling-out last year. (自从去年我们闹翻以来,我们就没怎么说过话。)
5. 表示时间上的距离:
It's been three years since I last saw him. (我上次见到他已经三年了。)
I haven't gone back to that place since then. (从那以后,我再也没有去过那个地方。)收到你的喜欢啦收到你的喜欢啦