自从...以后，我就再也没有见过他了。

I haven't seen him since the summer before last.

自从她得到那份工作以来，她完全变了一个人。

She's a changed woman since she got that job.

他从13岁起就一直在吸毒。

She's been using since she was 13.

自从三年前以来，我就一直住在这里。

I've lived here since three years ago.

他从9点钟就开始溜冰了。

He has been skating since 9 o'clock.

我从小就和他是朋友。

I have been friends with him since I was a child.

这些例句展示了"since"在不同语境下的用法，包括引导时间状语从句、表达从过去某个时间点开始持续到现在的状态，以及表示原因等。希望这些例子对你有所帮助。