Question

from then on from now on 的区别

Answer 1

then 指过去的那个时候，所以 from then on 意思是 “从那时起”，要与过去时态连用；now 指现在这个时候，所以 from now on 意思是 “从今以后”，要与现在时或将来时连用。例如：
* From then on, they were taking no chances. 从那时起，他们就不再冒险了。
* From now on you are free. 从今以后你自由了。
* It would be best not to see much of you from now on. 从今以后我们最好少见面。

Answer 2

from then on从那时起 (一般用于一般过去时)

from now on 从现在起 (一般用于一般现在时)