|char. self, oneself||
phr. I have felt poorly since I donated blood.
phr. He became fascinated with philosophy since he heard Mr. Zhang's lecture.
conj. since then, henceforth
phr. After graduating from the university, he just went home, I have never seen him since then.
phr. We've known each other since we were children.
phr. He lost his sight since childhood.
phr. Ever since he lost his job, he has been rather down.
phr. it goes without saying