Examples
zì cóng自从wǒ我kāi shǐ开始xué学hàn yǔ汉语yǐ lái以来yǐ jīng已经yǒu有liǎng两nián年le了。
自从我开始学汉语以来已经有两年了。
It's been two years since I started learning Chinese.
自从你上次来这，已经有一段时间了。
It's been a while since your last visit.
自从手术后，我父亲一直处于良好的状态。
My father has been in good shape since his operation.