自从 + Time/Event, (就) + Result
自从 (zìcóng) means "ever since" and introduces a point in time from which a situation began and has continued. It is placed before a time expression or event, and the main clause often includes 就 or 以来 to reinforce the sense of continuity.
自从他来了北京,就爱上了这座城市。
zìcóng tā lái le Běijīng, jiù àishàng le zhè zuò chéngshì.
Ever since he came to Beijing, he fell in love with this city.
自从毕业以来,我们就没见过面。
zìcóng bìyè yǐlái, wǒmen jiù méi jiànguò miàn.
Since graduation, we haven't seen each other.
自从学了中文,我交了很多中国朋友。
zìcóng xué le Zhōngwén, wǒ jiāo le hěn duō Zhōngguó péngyǒu.
Since I started learning Chinese, I've made many Chinese friends.