from that time
from then on
since then
I have not seen him since then
从那时候起我一直没见过他。
From that time he became periodically ill.
从那时候起,他就定期地生病。
From then on he abstained from alcohol
从那时候起他就戒酒了
From then on
since (过去时句子)or that time
From then on
from that moment on (来自高一英语教材)
since then