1. 从那时起:eat up 吃光 | from then on 从那时起 | monument n. 纪念碑;纪念物
2. 那时起:同...交朋友 make friends with | 那时起 from then on | 不时地,时常 from time to time
3. 从那以后:from now on 从今以后 | from then on 从那以后 | be different from 与...不同
4. 从那时开始:from the very first/beginning 从一开始,从最初 | from then on 从那时开始 | from time to time 不时地