ph.

1. They have been good friends since then.
从那时起他们就一直是好朋友。

1. 从那时起：393 shoot a film拍摄一个镜头 | 396 since then从那时起 | 397 something like大约,有几分像......

2. 自那时以来：6. during festivals在节日期间 | 7. since then自那时以来 | 8. in common共同的饿,相同的

3. 从那以后：graduate from 毕业于...... | since then 从那以后 | thanks to 由于

4. 自从那以后：48.travel around China 游览中国 | 49.since then 自从那以后 | 50.notice sth 注意..

2. since then的解释